American Circuit Breaker is the legitimate mfg of 'Stablok' breakers for FPE panels. I have not seen any 'other' brands.
Yes, ITE/Bulldog are still around, costs depends on who has them, and how many distributors are in the chain. Like anything else, volume means lower costs, and 'desparation requires a premium price.
As to ETL, most jurisdictions recognize it; it's a testing org like UL.
