Both AFV Club and Armour Track Models make individual track links for the M1A1/A2 tank. They are workable and much easier to assemble than the Dragon links.
AFV Club's tracks are #AF3512 and run about $15. Easy to assemble.
Armour Track Models' tracks are #TK-03 and run just under $30, but they contain a resin drive sprocket and idler wheels. While the box art shows the latest T-158LL track, the track inside is actually T-158. They also make the older T-156 tracks which are more proper for an M1/M1IP or early M1A1 so make sure you get the proper set.