Finding an LSA rental is still pretty tough and finding good instructors for a Sport Pilots license is even tougher right now and our local FAA FSDO is working with AOPA and EAA to try and fix some of the problems. Two problems right now are that most planes that meet sport pilot requirements are tail draggers and theres a real screw up in the instructor insurance for teaching sport pilots right now. With well over 500 hours in tail draggers from small to large my insurance would double to teach in an LSA over a regular plane and many companies wont write more than a million dollar policy for sport plane instruction. A young instructor building hours might not mind having his insurance coverage limited, but he probably has little to no tail dragger time and older instructors with plenty of time wont risk teaching without more insurance. A real catch 22 right now.
Id love to find an old Luscombe to do Sport Pilot, tail dragger, and limited aerobatic training with.
You can do a search from the EAA Sport Pilot website for instructors, but so far they only have about 400 listed nationwide and only a small portion of those have an aircraft to rent.
http://www.sportpilot.org/index.html