I met Chloe Lum and Yannick Desranleau, a pair of Montreal-based artists/silkscreeners who work under the name Seripop, at a rock show years ago and bought a couple of their posters. They make show posters, flyers, record covers, and art of their own at an alarming rate of production. And they sell their stuff for cheap. They're currently having a sale and have some prints here and here and some additional deals on their myspace page. They say they'll also trade for musical equipment, pre-1990s Archie comics, and records, so if you are interested, email them. It's a great chance to get some beautiful handmade art for your walls.