What I've seem on ebay today just makes me laugh. A single stitch cam for a Singer 403, 603,660, 750, etc. are priced at $``10.95 ach -- that's preposterous -- I bought 20 of the top-hat cams for less than $20. I don't think these items are going to sell at $10.95 each -- I sure wouldn't buy them for that!
Jeanette