I do have a a few left, but I'd suggest buying directly from where I bought them instead, that'll be cheaper and easier. You can see in the last picture what the prop adapter looks like, the propeller mounted in the picture is a GWS 5043, not sure that'll be the one I fly with but I might. The axle on the prop adapter is thinner than the 4mm hole in this particular propeller, so slight adaptations may need to be made.
Here is my source:
I got an offer of 4$ accepted, so that's 4$ for 5x shipped worldwide, that's less than I pay for just an international letter here in Sweden.