I like the look and taste of salsify, and have had it in restaurants.  However, I cannot find anywhere to buy it.  I don't even mind how it comes - tinned, frozen, fresh. 
I am fairly sure I have seen it in Waitrose, when I had one close by - not sure if they still stock  it, or if it is location dependant. They don't appear to have it via Ocado either. Need to be quick though - it's the back end of the season already. 