For motor parts or anything I’m shopping for, I just google ie. Evinrude power pack and see what hits from there. Most obvious is Amazon but other sites usually give more technical info that I research further then if I get a specific part number I google that as well. After much research I can usually zone in on a good price and web site that I’m confident in purchasing from. I’ll always check out Canadian and especially local sites just to give the closest guy the deal if the dollar difference isn’t that great. On US web sites I’ll fill in fake data until I get their shipping policy...no Canadian addresses - no sale, no customs/duty info - no sale, all costs must be up front. Time spent on research can save you big bucks.....ask the wife!
Hope this helps...