My experience with bullet casting has apparently been much different from most of these guys. The first tire shop I checked with here in Anchorage gave me several 5 gallon buckets full of wheel weights and even loaded them in my truck for me! If you can get the lead for free, and you don't count your time, bullet casting can be FAR, FAR cheaper than buying bullets, especially if you shoot quite a bit.
The way that I look at the time I spend on bullet casting is that I figure if I wasn't doing that, I'd be sitting in front of the TV or something else. Might as well do something productive that I also enjoy. I definitely agree that it's a hobby in and of itself, but that's certainly not a bad thing! I also wholeheartedly agree with the recommendation to check out the forums on castboolits.gunloads.com. The Castboolits site is a truly awesome reasource for the beginning caster.
If you're just starting out, I would recommend a Lee pot, probably the 20 lb. model. I picked up the 10 lb. pot, but only because I couldn't find a 20 lb. pot locally. For bullet moulds, you might post a message in the "Swappin & Sellin" forum on the Castboolits site that you're looking to buy some moulds--you might be able to pick up a good one for less than new. If you'd rather buy new, I've had good luck with my 2 cavity RCBS moulds. I would stay away from the Lee 1 and 2 cavity moulds, although the 6 cavity ones are good. Sourcing the wheel weights first before you buy the equipment is a good recommendation--I hear a lot more stories about how difficult it is to find good lead than about how easy it is.
Hope that helps, and good luck!
Mike