nobody sells G-13 anymore. Every strain out there is a hybrid, said to have been bred with G13 and some other strain. The closest thing your gonna get to pure G13 is G13xHaze. If you find pure G13 seeds, message me n lemme know. G13 is a myth in seed form from what ive experienced, and ive loooked everywhere for that little fucker, lol.
A more sought after strain, that you would more than likely get the same response from people as far as desireability, is Chemdawg.
The closest thing on the market right now is Chemdawg D, which is derived from two plants that Chemdawg parented. The Original OG Kush, and NYC Diesel-Which was originally Given to some NYC growers by "The Chemdawg", and They renamed the strain Diesel. Since then it has been rebred and fucked with, and its not the original Chemdawg strain anymore, but its close, just like the OG kush is close also. So they crossed the two strains, and apparently have developed a strain that holds the most original Chemdawg traits out of any other attempt at recreating it.
There are, however claims that Greenhouse is gonna have some of the REAL Chemdawg in stock sometime soon, said that they got their hands on a clone from the Original Chemdog, and are making effort to breed it, and produce seeds from it, but even then i dont see how its possible, because since the clone is female, they would have to X it with some other strain to produce seeds. Am i wrong about this??