I'm not telling you how to be a parent, but how about a little discipline teaching? :biggrin2:
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Wood is expensive. I don't know that you're going to be able to DIY doors or something on the bookcase without going over $30...
I think your better option is something like buying a chalkboard, dry erase board, memo board that's about the right size to cover over the bottom shelves kido's getting into. I think you'd have to nail it in place cause kids are surprisingly strong, however, with a bit of watching maybe L brackets on the back of the memo board or whatever with some magnets. Problem is you're probs gonna go over $30 in cost for that as well.
Cheapest [free] option is to move your books and only put stuff down there you don't mind kido getting into...