I also find .38 Super brass pretty often on some of the various gun forums I haunt. Not every day but 1-2X a week, which is often for that caliber. Generally better prices than GB too.
I would not buy plated bullets. Why pay as much as jacketed for an inferior bullet?
You can get fantastic .38 super and 9mm jacketed bullets at Montana Gold (or Precision Delta and Roze Distributors) for as much or less than Berry's and Rainier. For jacketed, any 0.355-0.356" bullets will be just fine.
For cast lead, look for 0.357" bullets (or, if you have slugged your barrel and it has a groove diameter of 0.355", you may be able to use 0.356" bullets).
Back in the '60s and '70s, those few that loaded 9x19 and .38 Super usually used 0.357" jacketed bullets 'cause there just weren't any 0.355-0.356" on the store shelves (and no internet to find the mail-order businesses easily).