When cities impose such nasty fees on disposal of mattresses or any trash they encourage people to dump then in a vacant lot or along the highway. It is counter productive and stupid to charge that much to dispose of a mattress. We have not got that bad here yet.  I can still take mattresses and sofas to the dump but they say no more then 6 mattresses a day.  I did once dump over 20 in one day all from the same unit.  The other way people get rid of thier trash is to rent a storage unit for the $1 move in special load it with trash and then never pay. How do I know well  where do you think the 20 mattresses came from.  The lesson is if you see matresses in a locker don't buy it.  You can try offering them free on Craigs list I have had good luck at that on ugly mattresses some people will take anything or you can offer to pay them $5 to haul it away.