knee and leg supports?

Hi,

I been having problems with strength in my knee and ankles lately. somebody suggested getting some supports such as what sports people use when they have injuries for example.

Can anyone on here direct me to a good shop that would sell such items please?

Also, does anyone on here use anything like this to help aid being able to walk better?

P.s Gone anon as don’t want to show work that I am having problems at moment with MS.

thankyou for any help given