Several years ago, we got hold of some manure from a local stables, which actually had a problem getting rid of it all, so it was free. I suppose we got about a ton eventually, and it filled an insulated compost heap, 4'*4'*3'. (The heap was made from old composite steel panels, used for supermarket walls, and was a fabulous place to compost anything).
After a year of working, (sometimes the panels got too hot to touch), it reduced to about half, and became the best compost we'd ever had!
So, I've probably told you as much as you already know; go to a decent stable supplier, using straw based bedding, but compost it as best you can, as it'll be too new, and get the benefits next year...
...you may be in time for it to reduce by the winter this year, so could use it by the end of December!