Your last couple of sales have been  ebay plus listings,  ebay plus buyers can upgrade to express post at a reduced cost  as set by ebay.  there are two amounts paid  $2.50 or $4.00 I think it relates to the value of the item.

Actually I think the buyer gets upgrade for free, and then ebay pays the seller the set amount, which is supposed to reflect the difference between standard and express post.

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