Just a suggestion, toss a few in with the invoice. Nice marketing especially to see an Amsoil sticker on a windshield. Kind of funny when someone is using Amsoil and there is a Pennzoil sticker, or another sticker on the window. That certainly doesn't help Amsoil. Seeing an Amsoil sticker might just strike a conversation with the car owner, and he could pitch the product, not even knowing he's pitching it. Just toss a few in with the invoice. If I had to pay for them, no cigar.