Heated electric massage products are a dime a dozen, but this one can do cold, too.
The Wahl hot-cold massager combines a cordless electric massager, a hot/cold gel pack, and an easy-to-use case to hold them against your sore spots. You can remove the gel pack and microwave it for a hot massage, or throw it in the freezer if you need to ice down. Just be sure to use promo code KINJAW at checkout to get it for $15, or $5 less than usual.