I just did this.
The first try I went to a UPS store, they said it was going to be like $90 to ship. I said BS, argued with them...they stood firm.
The second try I went to a Kinkos store, they said it was going to be like $110 to ship. I said BS, argued with them...they stood firm.
The third try I boxed it up myself in a mirror box (the kind where you make 2 open sides boxes then slide them together over a large, flat item). Then I weighted it, bought my label online and let the UPS guy pick it up at my work...cost like $15 to $20 bucks.
At the UPS Store and Kinkos they were trying to put it in a big huge box that ended up putting it into a bulk or large item category even though it was only like 7-9 lbs actual weight. When they do it that way it factors in size and bumps you up to some ridiculous pricing scale where its the equivalent of like a 60-80 lb package.
Just buy online by weight and drop it off or have it picked up.