Used to be, not anymore.
They can only be got for medical use now.
Available illegally, but you'll need to go some some dodgy gym and ask the local neo-nazi/football hooligan meatheads.
Selling steroids is illegal. Buying them and possessing isn`t. Of course. if you possess whole sale amounts, you might be accussed of selling.
This body building site explains things:
kulturystyka.pl/prawo-farmaceutyczne-a-koks-art-by-eor/