Walmart+ Membership
$1.50
This Cra-Z-Art Grinch slime advent calendar matches its Amazon all-time low of $20. (You'd pay over $30 elsewhere.) It covers 12 days of slime with 9 compounds plus charms, glitter, and beads. Shipping is free for Prime members.
Click through to Amazon for this price.
Good deal for slime enthusiasts, especially with the holiday theme and all-time low price match. Best value if you have Prime membership for free shipping.