My primary processor is a standard merchant account provider and I pay interchange plus 0.04%. Interchange is the set of fees Visa and MasterCard charge to the processor, and starts around 1.8% + $0.10 for card-not-present transactions.
I also accept PayPal as there's a large number of countries where credit cards are not easy to come by and fund, but PayPal is readily available.
Both the merchant account (1.84%+ + $0.10) and PayPal (2.2% + $0.30) are significantly cheaper than Stripe (2.9% + $0.30) which someone recommended last time you asked this two days ago.