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Amazon.com has Korky 6000BP Universal Toilet WaxFree Seal with Hardware – Toilet Installation Made Easy – Made in USA , Red for $2.17.
Shipping is free with Prime or on $35+ orders.

Walmart.com [walmart.com] also has Wax Free Toilet Seal Kit with Hardware for $2.17.
Shipping is free w/ Walmart+ or on orders of $35+.

About:[list][*]NO WAX, NO MESS – The easiest way to install a toilet seal ring & fix leaks[*]UNIVERSAL DESIGN FITS ALL FLANGE TYPES AND FLOOR HEIGHTS – Adapts to fit above, even and below floor flanges and 3-inch and 4-inch drain pipes