It's a little hidden, and they have crazy webpage names so it's tough to point you directly and have it make sense.
On the left under solutions, click "digital map data"
On the right, click: Map Data for DeLorme Software
In the middle, click: USGS 7.5-Minute QUAD Maps, by U.S. State
That will give you the cleverly named web page:
http://shop.delorme.com/OA_HTML/DELibeC ... tion=10340
I'd call and ask as they had a $50 special for a while.
Note: You will really want Topo 6 or up to display these maps, the built in viewer is very crude (i.e. old), if they even ship it any more with the data.