this all depends on what racks you are talking about. i priced out what it cost to build a six high rack out of PVC with tubs for someone and my cost was almost that of buying it built.

i also priced out what it would cost to build a friend a rack for his boas. he wanted to use those giant vision tubs. for 100 bucks more, he could buy the metal one so that is the route he is going. this rack would go floor to ceiling.