I, personally, love trackable items, but Rake2222 is right. They're very expensive, at $6 a pop. I understand the whole cost of overhead and paying for that.
I've not seen any cheaper trackable items...can you give me an idea where to find them? $3-4 sounds very good.
I love the idea of buying 50 codes. It's be nice to attach them to things I've made, like painted stones. How do I go about doing that? I've thought about just creating a simple, free web page and printing qr codes on stickers that would direct the finder to it, and attaching them. It'd be nicer to do it through the current system.