They really don't go for $700, your highest realistic sales price will be closer to $500 at the very tippy tip top on the best day of your life.
Sandana pants, those go for $400 and sit on the market for weeks. Its all about the right buyer. They're a collectors item.
Pro-Tip: Hang onto them, Sandana market right now is in a weird position. They've screwed over tons of loyal customers and the market will either bottom out or sky rocket.