Hello.
We ordered from Costco for our 12/4/09 trip to CSR. If I recall correctly, I placed my order and received confirmation within a few hours. After a couple of days I received an email that it was in processing, then a few days after that I received an email that the order had shipped. Costco's website only shows 3 days between ordering and delivery, but I do remember thinking the long processing time was a bit odd. Perhaps the notifications are not in synch with what has actually occurred. Regardless, I was glad that I didn't wait until the last minute, as I had read OP that the orders are sometimes rejected, and this left me some time to find an alternative.
I ordered Nestlé Waters Bottled Spring Water® 1/2-Liter 24ct Item # 117270 for $6.99, plus $0.46 tax. No shipping charges were incurred, nor receiving charges from CSR. In the shipping info, I addressed it to myself, with the resort name in the business line, resort address in address line 1, my ressie number and check in date in address line 2, etc. No problems getting it.
Next time, we will order from gardengrocer, due to the BLT $10 fee.
Sorry if this is TMI. Have a great trip.