Buy Auto Parts runs a $25 off promotion when you spend over $250, which is the page's main offer and works well for larger orders. With so many deals running at once, the best choice really depends on what you're buying and how much you're spending overall.
Smaller orders under $100: Start with the $10 off your order deal to bring down a smaller purchase. If you're ordering anything over $100 specifically, the $10 off orders over $100 is a better pick. Orders over $99 also qualify for free standard shipping.
Orders between $100 and $150: The $10 off orders over $100 gives you a quick saving on mid-range baskets. Alternatively, if free shipping appeals more than the discount, the free standard shipping on orders over $99 is available too.
Orders between $150 and $250: This is where your options broaden. The $20 off orders over $150 beats the smaller discounts, and you also have access to the 15% off orders over $150 if the percentage works out better on your specific cart. Work through the math on both to see which saves you more.
Orders over $250: The headline $25 off when you spend over $250 kicks in here and is worth checking against any product-specific deals. Buy Auto Parts also offers up to $500 off turbochargers, up to $250 off steering racks and steering pumps, and various percentage discounts on A/C kits, drive axles, and other components, so if you're buying one of those categories you should compare the fixed dollar discount against the targeted saving.
Buying specific items: The $20 off a 4-piece Monroe kit applies if that's your purchase. Various items get fixed percentage cuts: 31% off the A/C condenser, 31% off the 2020 Audi A4 radiator, 10% off all Intro-Tech products, and others. Check the product page to see if a targeted deal exists for what you're looking at.
First-time customers: The newsletter signup offer at the top of the page may include additional incentives, so signing up before shopping could unlock better savings than the standard deals above.
Remember that only one offer can apply at checkout, so add your items to your basket and compare which saving is biggest before you complete your purchase.