belter: try doing an internet search for his name and you'll almost certainly find info on his albums and label(s). With that info you can call around locally to see if anyone has any of his stuff, that is, if you don't want to buy off the internet. Most stores with large music departments can get albums that may not otherwise be in demand if you can give them something more than Keen's name to go on. I've not seen any shortage of his stuff in the CD shops here in the South, but shops in other regions may have less demand and don't stock his stuff.
SC