demolition & debris removal

[Tidal Creek]

I am about to rehab a house. It will need a full REO cleanout of contents, plus the demolition of 2 large detached garages which are collapsing and beyond repair. A have a couple questions, what is general rate for emptying a house of approximately 2200 SF? WAG figures are welcome. The last ones I hired out they put the debris in a large trailer and made several landfill trips. Also, considering that I will be having the garages demolished, could I possibly get a lower rate by having one company perform both tasks and haul away the contents in their dump trucks or put it in their dumpster if they go that route. Thanks in advance.