Not m/c tires but...
Had a sidewall bust open on my 02 Expedition, running stock OEM Goodyear, RT/S, 265/70/17. Goodyear dealers in San Jose area wanted $189 OTD for a new one... after reholstering, I went home and started shopping around online.
These guys had it in-stock, $109, two-day FedEx for $15 and no tax! So; $109+$15+$20 (to mount/balance)= sheeeit; I saved $65 on ONE tire.