Do-gooding indie rockers take note: starting today the folks at Merge Records are auctioning off signed posters from most of their current roster, including “Arcade Fire, Robert Pollard, M. Ward, Oakley Hall, Spoon, The Rosebuds, Superchunk, Portastatic, Destroyer and more!” They’re going two at a time over at Merge’s eBay store. The Arcade Fire joint was already up to $493 last time I checked. Since the proceeds are going to Oxfam America and the Food Band of Central and Eastern North Carolina, this represents one of those rare occasions where the collection compulsion could actually have a net positive effect on the world.