Yes, do not buy a glass tank. Either get a plastic cage or do a rack setup. You can take a look at the DIY forum for a bunch of great threads on DIY setups or you can buy plastic racks from the Boaphile or Animal Plastics. Honestly I think the Boaphile makes better stuff but AP is a good company too.
I'm building a Melamine rack that'll hold up to 8 full size males/subadult females and minus the thermostat it only cost me $120. My "first attempt at a rack" thread is on the first page of the DIY forum near the top if you want to look at what something like that entails. However the tstat I got is one of the best ones and ran me $130. Well worth it since in 2 weeks there will almost $2 grand in animals in there.