Amazon offers the GoodSense Coated Aspirin 325mg 500-Count for $3.05. Add it to your cart via Subscribe & Save to cut it to $2.90 and bag free shipping. That's about a buck less than what you would pay in-store locally for a similar product. It contains the same active ingredient as Bayer Aspirin.

Be sure to cancel Subscribe & Save once your order arrives, or you'll be billed for subsequent shipments.