hi audrey

i see you post from the uk - so many of the areas here in the usa won't help, but perhaps if you contacted groups who work with:
stroke
arthritis
als
parkinson's
lupus
post polio
multiple sclerosis
spinal cord injury

etc,. they might be able to pass on the availability?

i would also look for any soupport gtroups with newsletters etc.

last, i cannot vouch for this site - it's new and unproven, but take a look at:

http://www.mobilityoutlet.com

good luck, be well

paul