disneyaggie is spot on.
My very lucky DS5 has a whole lot of monorail toys for Christmas. We had a lot of Disney reward points to spend, and money from family, so I bought pretty much all the different things they had. I don't know if you have seen it, but the boxes the resort models, and the castle come in are huge, really huge. It cost me $15.95 to send home. Which was offset by the fact the tax was around that mark anyway. Absolute bargain! I have sent scrap-booking stuff home too, as that can be pretty heavy too, I think that was around the same, again offset by the fact that I didn't have to pay tax, so shipping was still cheap. We just could not have bought the monorail stuff home, no airline baggage allowance is that generous, and it would not have fitted in the trunk of the car, so it was really worth it. It took about 10 days to get here.
Bottom line if you are spending a fair bit, or have bulky items it's worth it. Obviously if you are only spending say $50, a shipping charge of $15 might seem a lot. It can be done at check out at pretty much all the retail stores and at the resort shops too, just tell them when you get to the counter.