Something I look for is picture frames at Goodwill/Thrift stores. They usually have older prints or whatever in them but you can usually pick them up for $1 and up and just take the pictures out.

LOOKING-4:WELDING SIGNS,Charter/Finance/PulOil/Trulite/TruTest-Oils,True's gas CORALINE/RAINBOW, Gardner 70 items of Yakima wa., Wa/Or/Id Chief items