Bigappleherp.com
FYI, Bigappleherp.com makes the same kind of heat mats as the t-rex cobras, slightly less in price. They're called dragon's lair heat mats, and they can also be used on plastic. I ordered those after I spoke to bah, because I'm in NY and they ship really fast, last time my order arrived next day. Besides, I LOVE paying NY sales tax.....NOT!
The advantage to the visionariums, vs regular vivs is that they come apart so they ship and move easy, they have front sliding glass doors, which means that you could stack them and it makes access to the animals really easy and the corner posts are ventilated. They also just look REALLY NICE. I am in an apartment, wish I had a seperate herp room, but don't, so looks are really important to me. The bottom has a recessed area to take a heat mat and the top is moulded down to fit a flourescent type fixure. The top is a plastic framed screen. You could also get the screen with a hole drilled to drop an incandescent fixture down for basking but then you have a bare light bulb right there in the viv. However, bah sells a bulb cage that would work with it.
I still haven't moved my animals in yet.