Did you get the buy one get one free Ziploc coupon in your inserts? Here are a couple of stores where you can use it to get free Ziploc bags:
Giant Eagle
Buy four Ziploc Bags at $2 each
Use two BOGO Ziploc Brand Slider Bags (up to $2.19) from the 4/11 SmartSource insert
Use two $0.55/1 Ziploc Brand Slider Bags from the 2/21 SmartSource insert (doubled)
Pay $1.80 plus tax out of pocket, Get $2 catalina back
Submit for $5 back wyb three SC Johnson Rebate (Thanks Saving in Akron)
Meijer
Buy 4 Ziploc Bags at $1.89 each
Use 2 BOGO Ziploc Brand Slider Bags (up to $2.19) from the 4/11 SmartSource insert
Use one $1/2 Ziploc Brand Slider Bags from the 2/21 SmartSource insert or two $0.55/1 coupons
Pay $2.78 plus tax out of pocket, Get $2 catalina back
Submit for $5 back wyb three SC Johnson Rebate (Thanks Saving Addiction)
At Meijer you could be paying less if your store doubles coupons. If you know of any other deals at other grocery stores, make sure to share in the comments so I can update this post with other deals available elsewhere.