I would go with OEM/Toyota parts on this. price is not always the best factor when buying such crucial things (you don't want to repeat this job anytime soon do you?).
in USA you can get best oem prices online from online toyota dealers (they are also local dealers, just hiding themselves hehe) via trademotion.com platform.
I come from Poland too, so i know a few ways of getting things shipped over there.
best way to buy is first to check for part number at toyodiy.com/parts (give it VIN number of your car) and search for "head gasket", it will give you listing of parts (don't bother with their prices, outdated usually).
then using this part number(s) check prices with either of online dealer for best price match (all are new OEM), e.g.
http://www.trademotion.com/partlocat...?siteid=215498 they offer good prices and discounted domestic US shipping - this one is located in the East Coast (Charlotte, NC), quick shipping to Jersey or NYC.
or
https://www.1sttoyotaparts.com/part_number_search.html - this one is located on the West Coast (Tacoma, WA) so it takes good 2 weeks for parts to show up on the East Coast. keep that in mind.
then you order that part from either of online dealers using shipping forwarder (local US address of freight company) to Europe (e.g.
http://www.shiptu.com/shopping-in-usa.html or ) which will forward the part to Poland for a small fee

easy?
that way it's original quality at prices way better then European. if you need it quick then you would have to buy locally.
good luck bro