Clutch, mentioned in the article as the company behind the subscription, is interesting in their own right. http://www.clutchatlanta.com/ It's a car subscription where you can trade your car out for another type. Insurance is included, so it's a flexible alternative to buying.
A bit pricy, though. So really only an alternative to buying new.
It appears that the way Clutch works is that a dealer group can basically act as the Clutch "franchise" for a metro area. Here in NC the local luxury dealer group runs the service and sets their own pricing and cars available. It's one of those services that seems so awesome but the pricing is just "too high" enough that you put your credit card in repeatedly but never click submit.
Can't wait for the price to drop by ~30% (which might not happen since it seems that each metro has an exclusive dealer for Clutch - no competition)
A bit pricy, though. So really only an alternative to buying new.