I found URL below after spending HOURS and HOURS looking thru the Mercury site and finding NOTHING that was Customer In for someone who may want to buy something. Once I found the part # I was able to check both sites and compare (BIG DIFFERENCE).
Now the bad news for this site and the other site, you have to know the part # ahead of time, because they don't list ANY inboard Mercury propellers. I had a 1985 APBA rule book and on the back was an ad for Mercury Marine. They had the propellors listed by class, then diameter and pitch.
I ordered a 280 propeller because it was the closest to the size I need (the 225 props don't have enough pitch for my boat).
Now with all that said, if you want to order a propeller and don't know the part #, send me a note and I will look at the rule book ad and see if I can find a cross match. Diameter and desired pitch.
This site was $700 for the prop I wanted and the Mercury site was almost $900. Bigger boats will have bigger prices.
The part # for my prop was 48-87324a1. I was told they are back ordered until 7/31 - we will stand by to be amazed.
http://www.mercruiserparts.com/?gclid=CLqP38uXjI0CFRuNYAoddXyxkA