if it's a good deal, rebuild it yourself. get you a repair manuel, take your time and you can do it. here are some { starting prices from Iboat}
Evinrude parts
bearing kit----priced at 129.99 ----------list price 249.00
rings ----------priced at 20.69 per set ---list price 26.99
gasket set-----priced at 24.29------------list price 31.99
phone # 1-800-743-1123
if it runs good, new rings would fix the compression. and while you have it apart, replace all the bearings with new ones. and new gaskets. should run like new. 284.42 dollars for parts. and taking your time, doing the work yourself. about 3 days.