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They should not be expensive at all as they are generally made of plastic and often found in cheaper tacky shops. My problem is persevering with wearing them every day even for 15 minutes. I dont think you need get expensive ones as it is the principle of pinhole camera which makes them work not the quality of the plastic or lenses etc. Bees, flies and other insects use this kind of bug-eye imaging system with many small lenses around a pingpong ball-like eye so maybe thats why they never need glasses. :-)
I'll let you know what happens, I just hope they aren't a big rip off like the x-ray spex I bought that were advertised inside a bubble gum packet when I was 12 years old