To the visitor driving in from out of state, the 127 Yard Sale seems like a kind of Ironman for thrifters. The “world’s longest yard sale” is a test of endurance and attention. Spanning six states, 690 miles and thousands of stalls, it traverses dramatic landscapes, delicate cultural terrain and two time zones. Seeing it all in the four allotted days — Aug. 3-6 this year — is enough to induce vertigo in even the most stable-minded deal hunter. But some of us are foolish enough to try anyway. The