Singer Rocketeer Slant-O-Matic 500
 

Will walking feet and quarter inch feet from other machines fit the Rocketeer? If not, where is the most reasonable place to purchase those feet for it?

IIRC it's a slant shank machine. Any of the Touch&Sew accessories will work. Touch&Sew accessories turn up pretty regularly and Ebay is full of them. Sew-Classic.com carries some slant shank feet including walking feet.
Rodney

Rodney is correct about the 500 being a slant shank machine.

I have found that generic or aftermarket walking feet do not always work properly on Singer machines. Try to find a Singer Even Feed walking foot for the slant shank and it will work correctly.

Also the Singer presser bar has slightly different dimensions than other brands, so sometimes you'll find aftermarket feet and accessories that won't line up properly with the needle. You've got to be careful with what you buy.

GoodWill.com has a ton of accessories most of the time. So there are more than just eBay or Sew-Classic.

If you stick with Touch & Sew accessories for the ZZ machines you'll find 99.7% of what you'll want for your 500.

Joe