I think they run the discount near the end of every quarter. Nitto has a rebate program which is counted on a quarterly basis.
I'm guessing that Discount wants to move certain types of tires so they max out their rebates from Nitto.
Just a theory...
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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