Hello mate,
Not sure i am too qualified to comment being pretty new to this forum but have you considered building one ???
I built my Viv and also a unit with cuboards and shelves etc for it to stand on so that it looks like a peice of funiture rather than say a tank sitting on a non matching type unit, Which is not a bad thing but as i have the space i preferred this look.
The Viv itself measures inches wide, 19 inches tall and 15 inches front to back.
The unit is 39 inches wide, 13 inches front to back and about 24 ish tall.
including the vents, glass, glass runners and basically everything other than the lighting it cost me £80 which is about $120 ish i think.
If you just made the viv as opposed to the unit you could do it for around £45 i reckon.
I have got some pics at home which i will upload as soon as i get chance so you can see it for yourself.
funky.
p's it's not hard, This is the first thing I have made since I left school yet between me and Karen (my GF) we did it in about a week just working on it for a few hours after work.