But is there anything for just a little more east?
No unfortunately, not covering any Canadian High altitude airspace. There used be one covering some Moncton sectors but it's been gone for awhile now. The Montreal sectors that are covered are low altitude only (FL280 and below).
Also what are the stations that cover the flights crossing the border from Canada around Maine and New York?
All the Boston Center sectors that border Canadian Airspace are covered by LiveATC.
ZBW09, 123.875, borders Montreal and Toronto Centers
- routing via NAR waypoint SYR
ZBW52/ZBW53, 135.700/118.825, borders Montreal Center
- routing via NAR waypoint ALB
- 118.825 used when required (traffic volume)
ZBW01, 128.050, borders Montreal and Moncton Centers
- routing via NAR waypoints QUBIS, TAFFY, MIILS, TOPPS
ZBW02, 134.950, borders Moncton Center
- routing via NAR waypoints EBONY, ALLEX
ZBW17, 133.450, borders Moncton Center
- routing via NAR waypoints TUSKY, BRADD, KANNI, WHALE, VITOL
NAR = North Atlantic Route System
All traffic from Europe to the east coast through Canadian airspace will flightplan via one of the above NAR waypoints. You can use Flightaware to see what NAR waypoint the flight is planned over (if it's listed, the route data is lacking on a lot of these flights).