Dr. Diffs shipping cost.

They are one of the worst. They ding you for shipping from every warehouse if you have multiple parts. Then, if you have a core to return, shipping comes out of the refund.

I feel like some of these vendors over-inflate shipping costs and call it "handling".

I'm sorry but a few washers do not cost $11 to ship
I ordered an $3.00 "O" ring and it cost me $6.00 to ship. An envelope and a stamp would of worked fine. I guess it costs $5.50 to handle the "O" ring.