Scott,
You can get both on line. You can not get an AIS stamp for your boat from any dealer/store. It will be mailed to you from Cheyenne. As to the reciprocal license, that could be issued from a license dealer, but the on-line process will also generate a mailed license from Cheyenne.
However, when you purchase on-line, you can print out the receipt for both and then carry them with you until you return home and get the mailed versions of both. The printed receipt is all you need for your trip. I did this just 2 weeks ago for my boat sticker and my brides reciprocal license. Had the mailed versions waiting for me when we got back from the week long trip to Buckboard.
Good luck and hope you have some success catching some fish.