Originally Posted by
quilt938
I have no idea what patterns the cams even make
Those cams are far too expensive. These are the most common Singer cams in the world. I have three sets, just because they're that common. I'd be looking at around $10 for a set.
Also, 328s aren't collectable. They're quite noisy to most people, and there are plenty of other machines capable of embroidery that are much quieter (319 comes to mind).
The patterns they make are easy to find. You can download a pdf of the 319 manual and look at page 8, but they're also printed in the discs themselves.
I've only ever used #4 (blind stitch). The rest are for power users or to demonstrate its features for a buyer.