Sammy's vins (standing for vintage) has not only vintage clothes but vintage movies, furniture, you name it and they have it. Not many there though, but Sammy has the best one. Hope that helps! :)
I saw Jason and Freddy there last year, so they will probably be there again this year. I'm not sure about leatherface... As for chainsaws, some characters (not neccesarilly the ones you mentioned) do carry real chainsaws, but they are modified with ...
funnn, I love going to thrift shops and finding all the real vintage stuff, not the "ae vintage died jeans" or whatever, lol. Vintage shopping is probably on of the coolest, and can be one of the cheapest ways to shop!