If you break it into pieces it will end up costing you much more since you have to pay for that garbage anyway. I see that you have two options, depending on where you live:

1. Take it to your recycling center. You will have to pay by weight, but probably a little cheaper than you were quoted.
2. If you use stickers for the rubbish you may be able to place the appropriate number of stickers on it and put it out for collection. Instructions can be found usually on the sheet of stickers itself, or with the instructions on garbage collection provided by your local community (either in the form of a yearly calendar sent to you or on their website).

In any case if in doubt as at your local community office for the best way to do it in your area.