Amazon has the Crock-Pot 6-Quart Cook & Carry Oval Manual Portable Slow Cooker, Stainless Steel
on sale for $20.39 This is the lowest price it's ever been according to the camel. You may be able to get an additional $10 off (making it $10.39) if you get this Amazon-Assistant-browser-extension-coupon deal (YMMV): https://slickdeals.net/f/10961567-amazon-assistant-browser-extension-deal-5-off-computers-10-or-more
This model is designed to be portable: "The secure-fitting lid and locking system create a tight seal between the stoneware and lid to ensure that up to 6-quarts of your secret recipe can go where you go with no hassle and no mess. Your car interior remains clean on the ride to your best friend's house, company picnic or family reunion."
It has 2,428 4.5 star reviews.