Testosterone Decanoate turns up in one place only, and not as a product in its own right: Pharma Mix-4 from Pharmacom Labs carries the ester inside a blend, which is why a single listing sits under the tag.
It is priced at $86.90 and is out of stock as things stand. The same product is tagged for the other esters in that mix, so those pages are the quickest way to see what it is combined with.
