Yeah, I had just found these at Jegs for $2- but their shipping on small stuff like this is killer. $14 for a $2 part that would ship in an envelope. I'm just spoiled- picked up a box from a local installer a couple years ago, I'd be shocked if it cost me ten bucks at the time... but they do so few gasket type installs now that they don't keep a lot of extras around anymore.
Luckily I had a few other things to order from Jegs, so shipping got absorbed in the rest of the order and it wasn't so bad. Precision LJC 914 C: LOCKSTRIP JOINT CLIP - JEGS Precision LJC 1135 C: Rear Window Molding Joint Clamp 1973-1993 GM Truck, Suburban, Jimmy, Sonoma [Corner Clip] - JEGS