I bought a dress and a top from the same buyer, the top was 99p and the dress £4.50, the postage for each item is £3.50 so when I won them I sent the seller a message about combined postage. I have no objection to paying £3.50 postage costs at all, but I do object to paying £7 for him to post both items separately. Yesterday I received a message asking me to pay for the items, again with £7 added on for postage. I sent another message back asking for combined postage and still haven't heard anything.
WIBU to not pay for these until the seller combines the postage?
Did the seller mention combined postage in the listing? Or did you contact them to see if combined postage was available before bidding? If so, then YANBU and seller needs to abide by the details in their listing.
If not, then YABU. Sellers don't have to offer combined postage, but many will as a courtesy.