The travel price mistakes that I've posted have often been honored. Whereas product price mistakes, like that $15 snowthrower, rarely seem to get honored...
Some good travel price mistakes from over the years that were all honored:
-$80 all inclusive air+hotel HNL
-$60 RT to Iceland
-$60 RT to Fiji
-$0 all inclusive air+hotel bahamas
-$0 all inclusive air+hotel vegas
-$150 RT to Europe
-2K Fairmont lifetime plat
-$28 for 3 nights in CUN
-$699 RT to JNB
-$217 RT to GRU
-Booking on LAN to drop fuel surcharges on flights on other carriers
-$0 RT to DEN
-$0 systemwide tickets on spirit.
-$460 RT to TLV in Business