Pfizer Depot Cypionate 100mg/ml is Med-safe approved in NZ.... On prescription $5 per 2 X 10ml vials... kinda cheap if you can get subsidy..
The half-life differeince between Enanthate, Cypionate, or Decanoate is slight.. something like 3-4 days for Enanthate, maybe 6 days (or less) for Cyp' and about 6-7 for Decanoate.. Any estered test starts to hit the blood stream after only a few hours, until a peak at about 24 hrs, the only difference is the time it takes hydrolase & esterase to cleave the ester from 17 beta-hydroxyl position of the D ring... IE: its half-life......
Any estered testosterone should be injected at least equal to its half-life, or more preferably twice per half-life to achieve stable blood plasma concentrations, and to avoid harsh peaks and troughs that can be responsible for side effects via aromatase & 5-alpha reductase...
So even at a 6-7 day half-life, decanoate would have to be injected every 6-7 days...`Not 3-4 weeks.. Not even every 2 weeks...!!