Have you tried a warm epsom salts soak?
When we ask what works for others, I get that, and I've done it myself. But all that really matters is what works
for you, and the only way I know of determining that is trying these different things for yourself.
The iPalm unit has a lot (12 pages) of
reviews on Amazon, and it's sold in a lot of malls, pharmacies, and big-box stores, so I would think
one of those venues would have one (or more models/types) set up so you could try them (keeping in mind that conditions will differ from using them at home first thing in the morning).
Do you know anyone with a TENS unit you could
try?
One that you didn't mention is a vibrating massager, which are the oldest type (been around almost as long as electricity) and come in the widest variety of models/configurations.
Something else to look for (and worth paying a few extra dollars for, IMO) is a liberal return policy that will allow you to try a unit for a few days, but return it if it doesn't work for you.
I spoze you could try dating a massage therapist, and if that works out, marry them, but that may be a bit extreme...
Doc