With orders of $25 or more, Amazon offers the Ziploc Avengers Sandwich Bag 66-Count 3-Pack (198 in total) in Ironman or Thor for $9.54 with free shipping. That's $3 off list and the lowest price we could find. Each 3-pack has a total of 198 bags in four different designs.

Note: This is part of the Amazon "add-on" program and can only be purchased with orders of $25 or more.