you can also do it by phone. 1-800-895-4248. i keep it in my cell phone for last minute additions to my boat that don't have their license. they give you a number to hold on to while they mail the license to you. i've had a few buddies do it while sitting at the bar during happy hour. pretty easy.
You can get the stamps, there's another part in the process after you do the license, go back into shopping. I forget what it's under but I think it's either under hunting or other. Look around and you'll find it. I went through the whole process to get mine but then it barfed on the payment page so I just went to Academy and got one yesterday.