You may find somebody who will process your material for a % considering you deliver material ready to be processed - I mean close cut fingers, cut out flatpacks, scrapped off monolythics, cut out or desoldered pins (preferably separated to few groups like magnetic and non magnetic variety etc.)
If you hope to find somebody who will take boards as they are there is a big possibility that he will lose on this deal as proceeds will not cover cost of chemicals, labour and time involved.
Bigger companies who process whole boards will not touch such a small amount.
You either can sell them as they are or further pre-process them (separate recoverable parts as I mentioned earlier).
Question is how valuable is your time and if you want to spend time pre-processing them or get cash and go hunting for more.