Aren't there any 'green dumps' in your area? These sites provide free compost and a few grades of mulch for the hauling. Usually a skiploader will fill a truck for minimal $$.

No, they've been discontinued. Don't know why.

My local utility offers free mulch...chopped up trees they've cut down. I wouldn't use eucalyptus, I have heard that they are one of the trees that contain chemicals to retard undergrowth... but that may just be a rumor...
Around here, there are companies that offer bulk mulch. Or, you can ask some landscapers... they might know.

Get out to the ex-urbs for nursery/landscape/mulch companies that offer mulch in bulk, not bags. Sold by the cubic yard.

In our area, a choice of bulk mulches in the $25 - $35 per cu yd.

Are you in southeastern FL? From Jupiter to Ft Lauderdale there are the Bushel Stop stores--just what you need.

WOW our mulch yards here charge 18 bucks a yard..glad i live here

Our green dump lays it out for $10 a yard, or free if you feel like shoveling!

this is premium mulch any color or chip size you want loaded on your trailer

Bushel Stop has pine bark nuggets for $24 a yard or $2.50 a bag. They will deliver for $75 - 70 bags per pallet.
Pompano - 954-975-4660 ask for Al
Pembroke Pines - 954-434-1729