If you have Goodwill stores in your area - they usually have quite a few similar types of foot massagers.
People get them as gifts and rarely use them so they end up donating it.

I found a very nice {in the box } heated foot bath/massager for 12.00.
I totally clean and disinfect any used things like that when I get them home.

He might like the ones with infra red light {healing} also.

Have they ever tried Low level laser or cold laser treatment on his foot ulcer?
It is healing like the infra red light but stronger and can penetrate deeper.
Also helps with pain relief.
My chiro uses it at times on my shoulder, wrist or back muscles.

some info links-
Laser/ Infared/ far infrared
http://laser.nu/
http://www.purehealthsystems.com/infrared.html
http://www.purehealthsystems.com/mus...in-relief.html
http://www.toolsforwellness.com/far-infrared.html

Electrotherapy
http://www.vitality-web.com/backstor...Stimulator.htm
http://www.medi-stim.com/overview.htm
http://www.rehabpub.com/features/82004/3.asp
http://www.spine-health.com/topics/c...ctro/el01.html
http://www.skylarkdevice.com/web-site/ele_thera.htm
http://www.bmls.com/electrodes/epc.php
http://rehabilicare.com/protocol.html