They want you to open either a Neiman's card or use AMEX. AMEX charge higher fees than Visa/MC, but I'm sure they have a deal in place. This is likely why international Visa/MC are accepted- an intl shopper won't open a US-based account, probably an occasional shpper, and obviously store doesn't want to lose the sale. Most shoppers at NM probably do have either/or/both Amex and NM card. The outlets target a different clientele, so it's not surprising that they accept the others. Anyway, this has all been covered in a long thread featuring, among others, kalra.