Most vendor's take credit or debt cards. All will take cash.
Some vendors take cards, but I always play it safe and bring cash. There is a becu on market street close by that has an atm too!
Most have card readers. Some will have a minimum amount to avoid a surcharge. Cash is always a good idea but I've never had an issue (and I rarely have cash on me).
I can't exactly remember the answer to this. I believe they took my card at a few of the shops.
Depends on the vendor. Some people will have card readers, but have cash on hand just in case.
Also If you have a EBT Card you can go to the market booth and they can run your card so you can also use your food benefits there..
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