I won something on ebay and paid $10 for shipping. After about a week and the item was mailed already (or it should have been anyway) I decide to get another of the same product from the same seller. Lo and behold I won it for 99 cents when the previous one went for twenty something. Anyway, am I wrong to assume that I would be charged the same amount for shipping the exact item? Because now the seller is charging me $20 (double). Should I just pay or question the amount?