i recently bought a set of avon azaros for my b6 through ron ayers. again, as mentioned above, the price was great but delivery time was a bit slow.
however, FWIW, i had clicked the wrong size when ordering and didn't realize it until they arrived. they did the exchange without any issues and the proper sized tire had been pulled and ready to ship upon receipt of the old tire. i had the right size tire at my door two days after they received the wrong size tire.
their order fulfillment time may lag, but their customer service absolutely rocks!