Losing rear view mirror bolt caps 2015 Sunstar 35F

[Upinsmoke]

Does anyone know of a source for the black caps covering the attachment screws on our Velvac mirrors? I've currently only lost one but have to believe that others will soon follow.
Velvac was nice enough to send me the drawing, and the part number, but I was a bit set back at $7.95 for four of them, and $21.46 to ship them via ground. This amounts to $7.31 per plug! I'm going to pass on their offer and look for other sources.
Thanks for any thoughts.