When I managed a local KMart lab, I used to take mine in and pour into the silver reticulator they had fitted; no bother at all, as it is easy enough to do, plus they got the silver.
Since leaving, I now have a large 25L container, that gets filled with exhausted fixer and when full, my mechanic is happy to send it for disposal along with his waste.
I'd love to get a silver magnet actually, just never done enough research to choose a suitable model. . . .