For shipping, they charged me what UPS charged them, which was about $35. It took about 2 weeks to get my dress back, but that's cuz I paid for slow shipping.
You might ask them about cleaning the dress for you - I know they offer a service where they preserve the dress and then ship it back to you, so maybe they could just clean it for you and ship it back. Of course then you'll prolly need to get the wrinkles from shipping steamed out, so maybe that wouldn't save you any time...