Walmart continues to offer the Ziploc 3-Piece Vacuum Seal Canister Set for $18.49. Opt for in-store pickup to avoid the $5.99 shipping fee. That's tied with our mention from last week and the lowest price we could find by $13. It includes .75-liter, 1-liter, 1.5-liter canisters plus an adapter (which can be used with vacuum-sealing machines).