not all humane societies post small animals that are up for adoption on petfinder so first I would call your humane society and let them know if they come across a male syrian to give you a call because you’re looking to give one a good home
describe what you want and if they don’t have it available now then give them your name and number so that they can call you first if something like what you want comes in
you may have to play the waiting game for a week or two before a hamster comes in and they give you a call back

another thing you can do is check petsmart or petco, yes they do have hamsters for sale but most pet shops also foster hamsters for adoption
when I worked at petco we had people come in with hamsters that they wanted to rehome for various reasons, some people didn’t expect it to be so much work while others couldn’t handle curable health concerns
generally speaking pet shops like petsmart and petco will have a back room for adoptable animals but you have to go there and ask a worker to see any of them
so if you can’t find any on petfinder and there aren’t any at your local humane society, check out the pet shop to see if they are fostering some

good luck!
References :

yet good job on looking at petfinder first! not many people do that! <3
References :
owning a syrian (teddy bear) hamster

Name: Waldo