This arrived today from one of the folks who runs Tixtrade, which launched yesterday:
”You can buy or sell Giants tickets from other Giants fans for free at www.tixtrade.com. Join in on the fun and start building feedback within the community. It's a great resource for Giants fans and will surely become a reliable place to find great tickets.“
This site enables Giants fans to buy and sell tickets to each other for free. (Well, you still have to pay for the tickets, but there aren’t any weirdo hidden transaction fees.) If I actually had money, I'd be looking to actually buy tickets, but I have given the site a good look, and I consider it a happy alternative to the usual suspects.