I bought a bunch of topo maps for the mass area a couple of years ago while out on the cape so I know three stores there that sell them and have pretty much all the quadrangles in stock. One is a sporting goods store on the circle at Orleans, another is the boating supply store in wellfleet harbor and the third is the hardware/general store in Chatham so I know they are around. Check a few good sporting goods stores that have not knuckled under to the mass gun laws and still sells guns and hunting licenses, alot of the trails are marked on them.
I collect maps and usually end up framing them....
One of the book companies makes a spring ring type binder of topo maps in one book about the size of a road atlas but they don't have alot of detail. You can also order them from the US Geological survey site or find links to their retailers who sell them for them. Basically you need the blank map that shows outlines and lists the map numbers for the quadrangles you are interested in, then you order them, they are usually around $10 ea, depends on the store, hiking and climbing stores can get a bit pricey...