I looked in your profile and I noticed that you have the 18-55, so I'm assuming you're looking for something wider than that. My best advice to you at this point is to keep on saving because you're going to need $400-500 to pick up even a used WA zoom. The 2 least expensive WA lenses are the DA 10-17/3.5-4.5 fisheye at $449 new and the Sigma DC 10-20/4-5.6 at $499 new.
When you're going that wide on a DSLR, you've got to consider the crop factor (1.5x), so it would be very hard, if not impossible, to find older film WA lenses that will be a true WA on a DSLR.
I hate to burst your bubble like this, but I know how you feel, although my longing is for a dedicated macro. Maybe I'll have enough by the end of this year to afford one. If you've got a birthday or any other reason coming up where people would be inclined to get you a gift, ask for cash for your WA lens fund. Maybe when the weather warms up in your neck of the woods, you can find enough stuff to have a large yard sale and raise funds that way. When there is a will, there is a way.
HTH,
Heather