All of my old ones I have given away while they were still usable, so someone else could enjoy them for a while. All, that is, except for my old Weber kettles that I would use until the bottoms rusted out. I just threw those into the trash.
Of course, I could kick myself now for not saving the lids and grates for building UDS units..
A Big Green Egg
1 Butt Ugly UDS
A Stok Tower grill
And, a gasser for the quick and dirty.