OK guys, for the record, here is how it works with Idaho's online tag sales. (By the way, even though IDF&G uses the exact same vendor as WDFW, the rules are different.)
If you buy your license online, you PRINT your license on your own computer's printer. It is still valid. No worries. If you want to get a plastic license, then you have to go to a vendor and either pay the reprint fee (about $8), or purchase another change to the license. Like a previous post said, for example a waterfowl harvest would do the trick, but this would cost another $5 or so. Beware, purchases of TAGS at the license vendor will not result in a reprint of your license.
On the other hand, if you purchase a TAG online when you buy your license, then IDF&G (well, the vendor) will send you both the tag and the license in the mail.
I know, it makes no sense. But it works. I have often carried my license, beautifully covered with cellophane tape, and never had problems.
By the way, my woods are closed. Season opens day after tomorrow. Arrrrgh.