GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Best bet is ebay I put in saved searches for the props I wanted to test, eventually one comes up but for a Rev 4 expect to dig into your pocket a bit. I saw they just tweaked the Rev design under the Mercury Racing moniker as Ventera so maybe used Rev 4 prop prices will drop. It took me a year to find one at a decent price