I found some more old Sharp EL display panels, they are all the same LJ320U21 model which is 6" 320x240 pixel. It also appears they have a resistive touch sensor on the top as well.
It looks like someone might have tested these previously as some of them have 'good' written on them and they where taken from a company that used to manufacture devices that used these panels. But i've not done any testing of my own and really have no idea if they are working, or even if they are new or used.
£15 each £10 each+ worldwide postage. They are located in the UK so UK/European shipping shouldn't be too expensive.