Re: omc stringer
Parts are not a problem, there's several dealers on the web and a constant stream of bits on eBay.
But you're right about not easily finding a dealership or competent mechanic to work on them. I tried a few places locally when I needed seals replaced, ended up doing it myself. Once you've had it all apart, the next time is easy. And cheap.
Cup & cone bearing, seals are ? price from a bearing supply place as compared to an OMC dealer. Same parts, LOTS of markup.