I am heading to DC in the next week or so (actually Rockville/Bethesda) and was curious if any providers in the area took credit cards, namely AMEX? Certain people in my house notice when I take a large sum of cash! Lol.
Need someone who does in call and preferably speaks Greek

Considering Amex's chargeback policy and very high merchant fees, good luck with that one!!! One thing you could do though is do a cash advance from your Amex card at an ATM. Good luck

JordannLee is right, Get a cash advance or something. Many years ago I used a credit card - on a night when the little head was doing the thinking - and LE traced me thru the credit card. Not a good idea. Plus, the provider has to pay a fee and wait to get their money.  Use cash.

Cash is king. Visit that ATM.