how to dispose of near-full expanding spray foam can?

Your local dump or landfill will have a disposal system for toxic or dangerous chemicals.  Be sure to check first if you need to go at certain times or have an appointment.  My local drop off site for toxics requires an appointment.

To dispose of a spray can you should try wrapping it in newspaper, and securing it with tape or rubber bands, and labeling it--then calling your city or county's trash haulers to let them know you have an expanding foam can you want to dispose of, and asking them how to dispose of it. 

Some things trash haulers won't pick up, or can't pick up legally--hazardous waste is one of those. Find out what to do by calling your local authorities, or a trash hauling company and seeing what they recommend. There may be a place to drop off this and other things such as partial cans of paint or other aerosols. You can't simply toss these things into the trash can. 

Would somebody please tell me why you can't by a replacement nozzle for a buck twenty five at Home Depot as they screw on?

Until the can is empty, it's hazmat and can't go in the landfill (the uncured liquid is nasty and it's usually propelled with butane). Check with your garbage utility for what to do.

Yeah, have used them.  In the Garbage can.  You will never get it out safely.  It is like a bomb. ergo the name "spray bomb"  It is a can under pressure.  It is not recyclable. Treat it as though it were paint.  If there is a hazardous waste disposal area for that then bring it there(as there is one can it is not worth the bother so into the trash it goes.)  Forget the axe treatment.  Think of it like a bottle of dried up Ketchup.=garbage that will EXPLODE.  The foam dried in the tube so a new tip is useless.   I pitch it in the garbage and it goes to landfill and slowly rusts on the outside of the car to release all of the liquid styrofoam in the can under half a ton of garbage & mud.  

. So where it is used is NOT DIRECTLY WHERE YOU WANT IT TO GO.  It just let go at the dump.  Wasted money for you. Keep It Simple Stupid tech.

The can will probably still work if you cut off a couple inches from the straw.Then you can either use it or empty it.

you could use a stiff wire and clean out the foam from the nozzle and tube

or you could use that ax and post the vid to youtube 

hazardous waste disposal in your community will take care of this

You throw it in the trash!  Jeez.  How do you get through your day if you can't figure this out??>

Don't know how to dispose of it - that's stuff's expensive, so maybe this will help.