I'm also checking on a carport or shop if I can swing it.So far the only thing I have checked on was a 30x32 steel pole building kit from Lumbermans you supply the concrete and labor it was $6000.00 which seemed to be a fair deal.
there's a business on 410 between Buckley and Bonney Lake that carries them, and the size you're looking for too. I believe it's Randy's Landscape supplies, and they are across 410 from Farm Fresh Produce. I don't know where you're at, but I know where they're at. :? .hope that helps.