Gbl (Gamma-butyrolakton), where I can buy this or how to cook this

[ByDan]

I'm living in Poland and here gbl is soo rare. How to produce Gamma-butyrolakton or where I can buy this legit?

 

[ASheSChem]

i think 1,4-Butanediol is ok in poland, no?
and it's the same like GBL; iniside your stomach it becomes ghb