Well, depending upon how serious you are . . . but if you've got space (doesn't take much room) and are on a shoe-string budget, you can get a good two-piece (barbell rack frame and bench) workout station w/ weight set at Wal-Mart for a small outlay of $$$.
Either that, or keep tabs on the local money saver / shopper's guides in your area, it's not uncommon to pick up the equipment second hand at fraction of what it costs new.
Actually I did have a nice set of weights, but my ex took 'em. ;_; I'm hopefully going to be leaving the province in a few weeks so I figure there's no point in getting a whole new set, not to mention the fact that I would have nowhere to put them.
Yeah, yeah... I know I sound like I'm making excuses... but I have no excuse not to at least do some pushups in the meantime!