yes poland is very relaxed when it comes to airsoft, (i'm from there born and raised)
to OP check out Krakow, Warsaw and the areas around Szczecin and Poznan
there are a decent amount of stores and fields. alot of the store clerks and field player speak some english, though broken.
depending on the length of your stay i might suggest getting something imported.
the guns hes looking at are JG's
"You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in ruttin' command here."