Can you do spin at home?

I guess the title says it all, the classes near me are only two days a week and expensive. Considering getting a spin bike so I can do it at home. Does anyone do this? Any suggestions on a brand? Is it possible to push yourself enough?
I am also considering getting an elliptical or a treadmill, it's one of these three because I don't have a lot of money to spend. Any thoughts??
In the past I have always been in shape because I rode my bike or walked everywhere, but getting a car has made it so hard for me to stay in shape I have been yo going for years. I need something I can stick with.