I've said it before, so what the heck, I'll say it again:
Any time you can pick up a Third Gen in good used condition with the box and at least the correct original number of mags for less that five bills, it's been a good day.
I'm sure a time will come when we will look back and wish that we could still buy them for that.
Congratulations on your score. And it's always fun to win a GB auction when your max bid is for what you consider a good price and maybe even a bit of a deal.