Amazon offers the GoodSense Ibuprofen 200mg Tablet 100-Count Bottle for $2.72. Check out with Subscribe & Save to drop it to $2.58. With free shipping, that's about $3 under what you'd pay at a local store, excluding the mention below.

Anticipating a lot of headaches? Walmart offers an Equate Ibuprofen 200mg Tablet 100-Count Bottle 2-Pack for $4 with free store pickup.