And do they cost about the same?
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Yep, they're about the same. Up to about $50 DC fees are slightly less than Paypal's; from $50 upwards, Paypal's are slightly less.
DC charges 3% plus $0.25. Within the US Paypal charges 2.9% plus $0.30. However, Paypal charges more for international sales (3.9%) whereas DC doesn't.