You don’t buy an OffSec certification.
You earn it.

“A will to suffer…is required for sure in order to finish the course.”
— Wesley Neelen –
"If you are already considering to take the course, don’t hesitate and just go for it – you won’t regret it."
— Michael R. Heinzl
"Having been in information security for the past 6 or 7 years and having been on various security related courses I must say that the 101 course from offensive-security is one of the best."
— Jason Alexander CISSP, C|EH, CCSA, MCSE

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