I have a pair of WalkAide FES, served me well and really helped with foot drop, unfortunately balance no longer good enough to use them.
Including fitting they cost £2350 each. They are still in clean excellent condition and in good working order. If you are genuinely someone who can benefit from these I am willing to accept £700. Note these will have to be set up to suit the individual but not expensive through someone like Physiofunction. Advise you check this out first so that you are happy knowing what is involved.