Yup, most yards I've checked with in VT won't take circuit boards of any kind. As machinist said, they look at them like they're the plague! However, I do have one yard that doesn't mind if I bring in a dozen power supply carcasses with a stripped board still attached, but of course it must go in the shred. Pretty sure they're not supposed to, but as long as it's a very small % of the total tin they'll look the other way.
Unfortunately that isn't enough for me right now... I probably have close to a quarter ton of these **** things stacked up. Still need to go through and pull out the salable ones, already have a dozen that are specialized (servers and small form mostly) or are obviously gamer supplies. Gonna have to put aside a solid day (or 2) for monitor/supply stripping very soon, I reckon!
Anyways, try throwing a few at a time inside your computer cases, brown boards still attached to the power supply's metal shell. Worst that'll happen is they will make you take them back.