I'm having a bit of an issue with an eBay bidder at present. The main violation for which I could is his wanting me to end a set of auctions solely for his benefit ("Can you end the bidding for those item so that you can calculate the weight of it?"), but that's ultimately just a part of a large problem I'm having with him. He had won a batch of auctions from me and being an international bidder, knew that shipping could get pricey the more items he bought, even when I combined shipping on all of them. He proceeded to complain about the shipping costs after being invoiced (despite the fact that they were calculated by weight and size of shipping boxes and I had warned him previously that the more he bid on, the heavier it was getting) and went on and on about how he had a "budget". I agreed to cut him a break on the shipping - at an loss of $30+ to me (on total sales of ~$300). At that point, I thought everything was resolved. I received another message from him that he could pay immediately, but not the full shipping cost for at least another five days and was expecting me to cut him ANOTHER $30 break. I told him no more breaks, we had agreed on the shipping, etc. Now he is bidding on MORE items of mine (the aforementioned ones that he requested I end early for his benefit...what happened to his alleged "budget") and requesting that I just squeeze them into the boxes with the previously won auctions - with no additional shipping charges, despite the fact that weight AND dimensions would be significantly increased, causing me even MORE money lost (to give you an idea, he wants me to "just squeeze in" guys like Optimal Optimus, Cybertron Jetfire and Cybertron Scourge). What I would LIKE to do is cancel his current bids and add him to my blocked bidders list along with canceling the sales on the auctions he has already won (and not yet paid for), but I'm uncertain of how I can do that without running into an eBay policy violation of my own. Any advice on how to deal with a real annoyance like this?