I bought my Pentalobe drivers from [http://kctoolsco.com|KC Tools Co.]. Great to deal with and purchase from. Look into Wiha and PL2.
Here are a couple links to a sets:
[http://www.kctoolco.com/wiha-26794-pentalobe-screwdriver-set-pl1-pl6-p/26794.htm|Wiha Pentalobe Screwdriver Set].
[http://www.kctoolco.com/wiha-system-4-esd-slotted-phillips-pentalobe-micro-p/75097.htm|Wiha Slotted Phillips/Pentalobe system]