Priority Bicycles is running two straightforward offers right now: the Priority Mik Rear Rack priced at $69.99, and free shipping on new bicycle purchases. Which one makes sense for you depends entirely on what you're buying and whether you need a rear rack.
Shopping for a new bike. If you're in the market for a complete bicycle, the free shipping offer is your best bet. It removes the shipping cost from your order, which can be substantial on heavier items like full bikes. This applies regardless of how much you spend, so it's a guaranteed saving on any new bicycle purchase.
Adding the Priority Mik Rear Rack to your cart. The rear rack deal is excellent if you're already planning to buy this specific accessory—$69.99 is the set price, not a discount amount. This is useful whether you're buying it standalone or pairing it with a new bike. If you're getting both a bike and the rack, you can still benefit from free shipping on the whole order.
Combining both purchases. Since these deals don't overlap in the traditional sense (one covers shipping, the other is a fixed price on a specific part), you can potentially use both in the same order. Buy a new bicycle and add the rear rack at $69.99, and the free shipping will apply to your entire purchase. This stacks the value of both offers together.
At checkout, you'll be able to see which option or combination saves you the most based on your specific basket. Compare the shipping cost you would normally pay against the value of either offer and go with whichever produces the bigger saving for your situation.