I just got a variety of feet and needle plates for my 335. Never have used the binding function much so I got a regular needle plate and feet.
Kwok Hing Sewing Machine Company in China. No min, and shipping costs ain't that bad. This is also your place to get binding attachments.
UPDATE: Just installed the "regular" foot, needle plate and dog. Dog needed some grinding to fit. You get what you pay for. :)