Hi, I'd go for another scrap yard, that waste levy sounds like sims metal?
there must be other scrap yards near by, the price of scrap steel should be
$140 tonne minimum and no waste levy.

the energy you would waste to squash 'em up wouldn't pay, your almost 50% better off straight up going to another yard anyway.
why not just stack empty towers and use them as small steel bins?
all the bits n pieces get stuffed into towers, so when full, you screw the side back on and you got a solid 20kg package.