I once haggled with a guy who was selling jewellery he'd made from a battered old suitcase when I was on holiday. Nice stuff, nothing valuable, just nice crafty stuff.
I offered him about 25% less than he wanted and he looked all sad and said "sure, ok, if you want… You can pay me that much if that's all you think it's worth. It just means I won't make anything for my time. But if that's how much you want to pay, you can have it for that…"
I ended up paying the higher price even thought I knew he was guilt-tripping me. He just did it very well.
HTH.