I had not been in Hobby Lobby for awhile, so I decided to drop in today & check out the clearance rack. They had the AT econojet 2 packs marked down to $13.36. I bought a couple of F20-7s packs. With tax it came out to a little less than $29.00 for the 4 motors. They have 3 more packs with a 4 second delay for the same price. I guess I'll pick them up later.