I've delt with several of the folks mentioned here and think that Don makes some real valid points... Only thing that I would add to his post is that the dealers that I purchase from have also been happy to deliver to a show that both they and I were attending. Not always a MV show either (I once met up with a dealer at a livestock show since he was comming to town for it and the fairgrounds are next door to my office...).
Oh, and to add to both Mike and Don's line on USPS. If you send it USPS to my home address, I may or may not get it... Every week, I get together with my neighbors and we exchange mail since it seems like our carrier believes in random distribution of mail into the boxes along the road... Send it to my office address, and it gets to loop around the building a few times before it lands on my desk...
UPS, FedEX, DHL all come to the office every day and the clerk in the stockroom pages me to come take posession of my stuff when it is offloaded... When they come to the house, they enjoy looking at the latest addition to the collection parked in the yard (while cursing about having to manuver the truck around them to get back out the drive...).
Good luck.