Tell your aunt you need some wires from that old Pentium computer she has, and take it to be recycled.
“Drop in” at your friends on the way to the dump with half a trailer full of rubbish, and ask if they want to fill up the other half for free.
When there is a book market on, visit your friends and take away their old books to go to the market. Boxes of books they don’t really want but which are too “valuable” to throw out.
Tell your friends you are doing a metal recycling run, and does anyone have any old metal that they want gone?
One friend I took 3 or 4 trailer loads of stuff away, mess which was really depressing them, and it has really cheered them up over the long term.