On I-81 at Scranton, Pennsylvania, there is a large Petro Truck Plaza that offers RV 30 amp electric for $10 ($9 if you're a Good Sam Member). We have spent the night there several times when passing through as recently as October, 2006. It's a nice, safe place right on the highway, and the price is right. You can even get Scranton TV stations on the antenna.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)