Thought it would be a good idea to put these in one thread. I'll try to find the expiry dates. Added dates.
Costco
$70 Bridgestone - Sept 1 to Oct 5, 2014
$90 Pirelli - Sept 15 to Oct 5, 2014
Added Oct 1, 2014
Oct 15 – Nov 30, 2014
$70 Bridgestone mail in Rebate (WS80, WS70, WS60, W965, DMV1, DMZ3, LM25RFT, LM32, LM32RFT, LM50RFT, LM60, LM60RFT, MZ03RFT, LM25 4x4)
Oct 6 – Dec 15, 2014
$70 Michelin mail in Rebate on any set of 4 tires