Walmart offers the BV Bicycle Strap-On Saddle Bag / Seat Bag, model no. BV-SB1-M-WT, for $6.32. Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest price we could find by $1. It features 3M Scotchlite reflective trimming, Velcro straps, expandable medium and large saddle bags, and taillight hanger.