Karina, generally speaking, you don't really need bilingual books--you just need books in the minority language, in Spanish. Maybe your local library would even have a section of children's books in Spanish, or would be willing to start growing one? Although I've built up a large home library of books in our minority language, over the years, it's also true that I've taken full advantage of the collection of minority language books available at the library in town.
As for obtaining Spanish books online in thrifty ways, I invite others out there to offer suggestions!
Adam Beck is the founder of Bilingual Monkeys and The Bilingual Zoo, and the author of the popular non-fiction book Maximize Your Child's Bilingual Ability amzn.to/22XKuCt and the humorous novel How I Lost My Ear amzn.to/2EsjVRS, both available worldwide.
I have had some luck using "Craig's List" type sites in Spanish speaking countries. Just like in the U.S., you find people looking to unload their children's libraries after their kids have moved out. Usually the exchange rate works in your favor. The problem, of course, is shipping. If you have relatives or friends in a certain country, this can be negated somewhat by having them pick up the books and packing them in their luggage next time they are in the states.
The cheapest way is to borrow books from public libraries. You can keep them for several weeks.
Another way, if you have family overseas, ask them to buy some books for you, and bring them when visiting.
Also, the public libraries, at least here in Arizona do many book sales where you can get books as cheap as $1. Also, find out which libraries in your city offer bilingual (English-Spanish) story times. In some special celebrations they give away books for free.
Check also some Baby/Children yard sales on FB; you may find some in there too.
I have a friend who is a school teacher, and she can buy some books for me on Scholastic with a special discount for teachers too.
Half Price Books, if it exists in your area (I think they cover most if not all of USA) have a children's foreign language section. Even in the middle of monolingual Iowa I managed to find quite a few Spanish books there. It's usually right next to the kid's section, and separate for the adult foreign language section.
You could also try to exchange books with other bilingual families you know. I have mentioned this to my friends but so far we haven't got around to doing it. Books are fairly expensive in Spain plus they often tend to sell hardbacks (which are more expensive). I don't think half price bookshops exist and where I live there aren't any second hand bookshops...but try secondhand bookshops and charity shops too. I got my books mainly from Amazon as where I live there is little choice in minority language books especially children's and they are more expensive but am also starting to look at Ebay. Are there any other UK online discount bookshops that I could order books from? Even starting to consider buying a Kindle/Ebook as you can download many books cheaper (although I prefer the traditional books!).
Also, if your children are young and can't read yet, you can just use your English books you have and translate or make up the story in Spanish. It's just about them hearing the story in Spanish and the pictures helping them to understand what's going on and learning new words. Sometimes I shorten stories when reading in English to the kids...but of course I get caught out sometimes lol. My daughter is like, hey, you skipped when X, Y, Z happened!
Mayken: My daughter's ml homework for this week included baking a cake - there's a cake in the story they read, and after each chapter there are questions and tasks, and the current chapter has the step-by-step recipe. She's to bring the cake to school too.
May 1, 2018 23:48:48 GMT 9
Amy: What a nice original homework! Makes such a change from standard homework, and I wouldn't be surprised if kids remember more from it! I like your bilingual school Mayken! Lucky little girl, and lucky Mummy!
May 2, 2018 0:00:43 GMT 9
Mayken: ml cake homework update: About half the class brought cake (8 out of 15), not all of them were the cake from the book recipe, but my daughter's was the most popular. (Maybe because we added food colouring and topped it with chocolate icing and smarties?)
May 4, 2018 5:58:10 GMT 9
Adam Beck: Cake is definitely my favorite kind of homework!
May 4, 2018 11:28:51 GMT 9
Jana: One of the best parts of having kids in bilingual school was getting Mother's Day cards in two languages! (With less-than-perfect spelling in both!) Ha!
May 15, 2018 9:16:08 GMT 9
Amy: (Twice) Lucky you Jana! So nice to read exciting pieces of news like yours!
May 16, 2018 5:46:25 GMT 9
Mayken: I still have that to look forward to, Jana! Mother's Day in our ML country is two weeks later, and the ml teacher goes along with that date. (It was last Sunday in our ml country.)
May 16, 2018 5:58:11 GMT 9