Well, I started out with a very pretty tank....and am now using a plain ol' plastic tub. My BP helped make that choice for me by going on a 2 month fast. As soon as I switched to the tub, she snapped out of it.
Here is a list of the items you'll need to set up a glass tank...I'll put price estimates where I know them.
1. Glass tank 10g, 15g, OR 20g longs
2. Screen lid that will slide on and lock in place
3. Under Tank Heater (UTH) ...can be had from the petstore for around $30
OR
3. UTH ...Flexwatt...can be purchased online for about $10 for your purposes
4. Thermostat to control UTH ... around $65 online
OR
4. Dimmer switch to control UTH ...about $12 at hardware store, but is not as accurate or safe as a thermostat
5. Substrate of choice (not pine or cedar)
6. Water bowl
7. Multiple Hides (your choice but make 'em small and tight and identical)
8. Cage decorations