Like gwEm said, make up some stock backing drum tracks and just get on with it. That way, when you go out and do a live gig with your backing coming out of the P.A, you a) have everything spot-on in time and b) you can use it as an advert. Just mention halfway through the set that it's temporary and if anyone wants to audition for drums to get your contact details after the set.
Works a charm, mate.
My band did our first few gigs with a temporary Bass player (who is now our Guitarist) and we just said at the beginning of the set "This is Mike, he's stepping in to play Bass while we search for a permanent player. Anyone interested can see us after the set".
One of my old friends was in the audience and loved our sound so much he came up to us and said "I know I live 40 miles away, but could I try out?" I told him that, as I know how damn good he is, he didn't need an audition. He's been with us ever since.
Seriously, carry on with a backing track, and you don't know who might be listening and dig your sound, you might end up with a kick-arse sticksman! :D
best of luck to you mate, I know it's frustrating, but nothing beats bad luck like a severe case of persistence. Even timeless immortal forces of negativity give up sometimes when it's obvious that your not going to.
