Transportation costs quickly exceed the value of the used gypsum board. See Division 9 - Finishes. One local recycler is experimenting with composting drywall waste. It is a biodegradable material. It is illegal to dispose of paints and solvents in most landfills.
Many communities have special arrangements for toxic waste disposal.
Call your city government for information. See Division 9 - Finishes. Carefully estimate the amount needed to avoid large quantities of leftover paints or solvents. Leftover paint can be used as a primer on another project or given to someone who can use it. In Seattle, Habitat for Humanity has a program where leftover paints are combined and used as primer or finish coat where the desired color happens to be Seattle Beige.