Yup, unless I'm going after a trophy or a draw hunt I always buy a bonus tag, that lets me hunt until I kill no matter what part of the season it is. (its a doe or <4" spike ) tag.
Yes, for a few years now - I buy all of them on-line (hunting, fishing, upland stamps, deer tags) - easy to do and never had a problem.
You don't have to purchase all of them at once - their system will just update your customer id. If you register for a hunt on-line, you can use any of the license numbers and it will find your correct license information for all that you have purchased.
The last few years I always get them online - fishing hunting turkey deer. Pretty easy and just print it out, plus you have a copy if you loose it or something.
Last time I had them do it at the local department store it took half an hour and cost $5 more for Advil. I did it myself in 5 minutes. Never know who is going to be behind the counter at the store but I know the guy behind this keyboard can figure it out .
I have done this for awhile until I found out that if you purchase it from a check in station they get something for selling it to you. We only have 1 check-in-station here where I live. I get mine there to help him get something for staying open longer in the winter time.