With orders of $25 or more, Amazon offers the Instant Pot Sealing Ring in Transparent White for $4.48 $4.37 with free shipping for Prime members. That's the lowest price we could find by a buck. It fits 5- and 6-quart cookers.

Note: This item is offered as part of Amazon's "add-on program" and can only be purchased with an order of $25 or more.