Lifts
There's a lot of them out there, both U.S. and foreign. I looked for months and finally purchased a four post 7k lb unit from American Custom Lifts, out of San Diego. Brad Davies, the mgr there, was great to deal with.
www.aclifts.com
Just had it installed today. Seems well designed, very sturdy and had all the safety and operating features I wanted. They also have a guy(s) who will load it up and deliver essentially anywhere in the country...for a fee.
Prices vary depending on specials being run, options, design and weight limits. My biggest concerns were safety - enclosed leg design, positive four post locks, etc. I also got the aluminum ramps for easier handling and full drip pan coverage to prevent liquid drips onto the car below. Finally, I wanted a dealer who could provide reasonable shipping and installation.
Many distributors will motor freight it to your door, where the truck driver will tell you to come out and figure out how to get the ~2500 pound bundled rig out or his truck and into your garage! Check this issue carefully as you consider various vendors.
By the way, I can't believe I've lived so many years, crawing under cars on ramps, when I could have had this rig and worked on my cars in realtive comfort!
Good luck.