+1, agree with the Bilgemeister.
Especially, if you pay with Paypal, and respond with issues within 90 days, or perhaps it's 60, you are covered.
I ordered some brake pads about 6 months ago, and neglected to open the package until last week, when I discovered they were the wrong pad. I requested, and received a full refund, despite the fact that I had failed to bring up the issue in a timely fashion. Of course, the wrong parts, even if they are free, don't do much good.
If I'm in a hurry, I'll buy from Hitchcocks. Their pricing isn't bad at all, it's the shipping that is painful.
If I'm not in a hurry, I'll buy from two alternate sellers, at the same time, figuring one shipment will likely get through. If they both arrive, that's fine, plugs and filters will eventually get used, and if I have no use for them, I can resell them at a profit. Parts command a higher price being resold from a US seller, because folks know they will get it much sooner and more reliably.