Icy hot makes a new pain relief patch which is a tens.... about 30-40 dollars. Uses a button battery and I hear it wears out fast.

Omron also has an OTC Tens on Amazon for about $30. It uses AAA bats which you can buy rechargeables for. This one has pads and wires, the Icy Hot does not.

When I was in PT a few years ago the therapist told me TENs do not "heal" but IFc does. I was receiving IFc for a tendon injury.
Somehow IFc (inferential current) changes nerves and heals.
IFc usually has 4 pads, and TENs 2.

TENs only mask pain, which returns after it is used.

You can Google TENs placement and find sites that show where to place the pads if you get that type.

I think Lidoderm patches are very good for PN pain. They were developed for the nerve pain left by shingles. But you have to place them in the right spot...if placed wrong there is usually no relief. I've used them for many years. (on and off for flares)
They put my MP pain into remission after 2 weeks.