e-bag is irratating me!

So, I thought I scored a halfway decent bumper for my 67 off of ebay for $40, seller had shipping agreed said it'd be a flat rate 19.99 UPS shipping, and now, a week after i "won" he contacts me to say that the shipping will actually be $38 and he never checked?!?!

I'm thinking of asking for a refund and waiting on a different bumper or something, it's only driver quality, what do you guys all think? do I go for it, (he only wants another ten) or walk and wait?