Advance Auto Parts cuts $50 off orders of $100 or more via coupon code "WD4" for the first 1,000 customers. The same coupon yields $40 off orders of $100 or more for the next 1,000 customers and 30% off sitewide for the next 2,000 customers . That beats yesterday's mention of $40 off $100 and ties last month's mention as one of the best discounts we've ever seen from Advance Auto Parts. Shipping starts around $10, or spend $75 or more (after coupon) to qualify for free shipping. (Free in-store pickup is also available.) Some exclusions apply.