An alternative to K-Y Jelly. It comes in a big toothpaste-style tube, making it cheaper stuff than AstroGlide. It's nice and smooth, and stays that way (that's not to say it won't dry when exposed to air, just that it dries smoothly). Like K-Y, this stuff is also water based, so it won't eat through your* condom.

(*Note that when the condom is inserted, I tend to consider it community property, regardless of who made the initial purchase)