Steve,
About the only dedicated presser foot you need is the Straight Stitch foot. Any other low shank ZZ feet or attachments will work on the machine. It only parks to the left on SS.
I get my feet and attachments when I buy the sets with machines, or on GW auctions, or my LSMG, or other legitimate on line stores such as Sew-Classic. I don't do eBay at this time so I have no idea what they have.
Joe