My experience with ordering parts from the Classic Center in California:
I send my request to Tom Hansen. I include the item description, part number and price from an online vendor. It you check, you will often find discounts better than 20%. Sometimes parts are not available, out of stock or have updated part numbers. Tom gets it all squared away, and in most every case, will match the online vendors price. I am often amazed how quickly they get things shipped and when you have to go OEM, I have not found a better source for parts.