Hi Jeremy! Thank you for your response.
As I see things now, on checkoutmycards.com, the card shows as $1.88 plus 25 cents shipping, but shows as $2.38 on COMC in "simplified shipping mode". In "advanced reseller mode", it shows as $1.88 plus 50 cents shipping. On checkoutmycards, the card shows as the cheaper card. On COMC, it shows as the more expensive.
When I go to adjust the price on COMC.com in simplified shipping mode, it shows $2.13 plus 25 cents shipping, under "you own this item", but it shows as $1.88 plus 50 cents shipping under "item details".
If I switch to "advanced reseller mode" I see the price as $2.13 plus 25 cents shipping, or $2.38. Yet, it also shows as cheaper than the other guy's card at $2.14.
Suppose the card sells at full asking price. How much do I get? $1.88? $2.13?
Suppose someone makes a 50% offer while in simplified shipping mode. What's the lowest they can offer? 94 cents plus 25 cents? $1.07 plus 25 cents? 94 cents plus 50 cents? And what amount would I get? 94 cents? $1.19 (94 cents plus 25 cents)? $1.07?