Let me know if you want a blue flex bar and some broccoli rubber bands. Flexbars never did much to help my tennis elbow. Broccoli bands are the best bang for the buck extensor bands.
Armaids and Rolflex make an excellent product. Armaids is more arm specific, Rolflex is good enough on arms and also good for calves.
Voodoo floss has offered a lot of short term relief.
Sport grips sidewinder has done a lot to help my elbows. My wrist extensors were so weak compared to my flexors it wasn’t funny. I get that it’s essentially the same movement as a flex bar but it’s about a 1:10 time ratio on work.
One other thing I’ve been working on is not squeezing the bejesus out of the steering wheel when I drive. Didn’t realize I was doing it until recently but not doing it has helped my post workout grip recovery tremendously.