I'm a licenced engineer, and I was looking after a Sundowner or similar Beech model some years ago. A fibreglass wingtip was broken one time, and I had no problem in getting a new one from my usual supplier.
Maintenance on any Beech should be straight forward for any competent workshop, and I don't see any reason why spares should be a particular problem- the engine spares would be standard Lycoming/Continental, and airframe parts ordered in from the US, same as for a Piper or Cessna.
I can recommend the place where I work now- send me a PM if you like.
Last edited by toolboxstickers; 29th Jun 2013 at 23:23.