Just wondering if anyone in the "buiz" can point me in the right direction. I have a Delta model 80 air pump in need of new diaphragms. I am seeing prices of $100 for rebuild kits, which include 2 rubber diaphragms, 2 plastic covers and a tiny plastic safety screw. This just seems like INSANE highway robbery!! Wondering if there is a wholesaler or another source I can get these parts from, or if I just have to bend over and grab my ankles??