Back in my youth it was always $50 for a ten strip, or if you were buying off a friend that had a strip it was $7 for a single. The guys selling the strips wouldn't sell singles or even sell more than a single strip to a person in one day.
There were many times I flipped my strip a couple hours after getting it and they wouldn't let me get another one til the next day. Not sure their reasoning, but once they got popped that was the end of real L around here. Then about 10 years ago people started buzzing that L was back but it was just people selling the latest RC as L and thats been the market for me since. Can't even get shrooms cause a few years back someone decided to buy grocery store mushrooms and dose them with some random RC and under cut the real ones to the point that those that had the real ones just shut down shop rather than sell 1/8ths for $5.