To answer your questions:
a.) It is not necessary for him to be in a 5x2x2
b.) I don't have any links, but you could visit the websites of the people advertising on here and compare prices. I bought my cages off of Craigslist.
I have 3 beardies and the smallest cage for an adult is a 40 gallon breeder which is 36"x18"x17". My 2 females are in 3'x2'x18" and my male is in a 4x2x2.
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