There is a web site
www.GoodSportAviation.com that has a lot of good information on the Sport Pilot rule and Light Sport aircraft.
There is also a nice chart that compares Private, Rec, and Sport Pilot certificates.
The site is connected with Palm Beach Flight Training which has a light sport aircraft (zodiac 601) for rent or for instruction for Sport Pilot. The rate is a low $118 which included Plane, Fuel and CFI. The plane itself is $80 and located at Lantana Florida just south of West Palm Beach.
Or you can purchase a 25 hour Sport Pilot pacakage for $3240. See the
www.goodsportaviation.com site for more details. Then if you want to go further you can apply all these hour towards a Private Pilot Certificate.
Good luck, have fun and "Be a Sport Pilot"