Set a service fee for accepting CC on orders for less than $10. Or, all orders on the cart. how many order does one get that are $30 or $40? It could be waved for large orders. …… Processing fee plus a percentage, say 75 cents or $1. Then it is the customer’s choice.
… If most of your sells are $8 to $15, you may be slightly behind on your CC cost, but the difference should reasonable & acceptable. If your sells are small then you should be a little ahead on CC cost.
Remember not long ago, many business had two prices cash & CC.