Google “mattress disposal near me” and you will probably find a few options. You may have to pay if you aren’t able to transport the old mattress somewhere yourself.

Also, if you are buying a new mattress, I suggest asking the seller if they can take the old one. Some will. I’m surprised this new regulation doesn’t also require them to begin doing that too. Some states already have that.

Edit to add that the local dump near me recycles them for free if you have a sticker.