The Crock-Pot 20-oz. Lunch Crock Warmer is on sale at Amazon for $15.99 with Free Super Saver Shipping on orders over $35.00 or free shipping with Prime.
Review: 4.7/5 stars based on 656 customer reviews on the product page.
These were posted last month, and the month before that and they seem to do really well everytime they're posted. Enjoy!
The blue and the red ones are priced at $19.50.