those are great thanks 
  i put a wanted ad on craigslist a while back for pallets in my area (for some 
compost bins.)
 i got a response form a Kia car dealership nearby for 5'x10' pallets,many as i wanted as they came in often. 
 i found out they werent the only dealership happy tog et rid of these big pallets,most pay soemone to haul away. 
 i had no need of such a large pallet and got other replies for easy to movestandard ones.but i bet they'd make a hell of a shed. 
 i do need to build a new shed. i'm debating  on doing the pallet thing with ply and shingled roof. or just make some metal conduit hoops and cover with a heavy tarp...which would be a lot less work and cost.