I can get a brand new, unprimed bumper from a somewhat local dealership (heuberger) for just over $200 local pickup... The few XV bumpers that are on ebay are damaged, and end up closer to $300.
I'm not worried about sourcing the part, it's whether the cladding on the arch is easy to remove with no holes. It appears to be molded on though, looking at the pics on ebay. So that would mean I would need to get the arch molding for the fenders as well. And I don't think it would look good to do just the rear arch, so I'd probably have to do the front arch as well, which means I'd probably need to do the front bumper, which has different fog lights... costs start adding up...
I guess I'll just keep the Impreza Sport bumpers...