I just scored two 98 770 Sharks and a trailer (no paper work) for $1000. Both seem to be in working order and in great shape. Does this seem like a good deal? Where is the best place to get parts for these machines? I know I need a srew in plug on the rear of one ski. Also what type of oil can I use and where is the cheapest place to get it at? I live in Pa and am new to PWC's in general. Thanks for your input!!