Yeah, I got this at a yard sale and I can see why they only wanted $2 for it! 'Cause it's broken, lol.
I will try the LFS next, I'm not sure if they can get it in, but they will probably try. None of my LFS have any parts in stock except Whisper impellers and maybe bio-wheels...
Air pumps seem to last a lot longer for me if they are a) held over the water level and b) used to power anything but an airstone. I'm sure if I replaced them as often as I ought to, it wouldn't be a problem, but I let them get really clogged before I actually swap them out. If I just use them to power box filters (the kind that don't need airstones) or sponge filters, they last almost indefinitely.