I got a couple socks at Academy for $15 each. They aren't real big, but were a bargain and do work. On an 18ft excel in about a 12-15mph wind, they got me exactly at .5 using 2 of them. They probably would be fine for slowing down an outboard for cranking.

Just checked again...the 36's are 15 bucks. 30's are 13.