The Echo CS-500P is also a great saw. Very light and powerful for the cc. It's only 50cc, but will likely out-cut your
old Farm Boss.
Echoes have a good rep, and 5y consumer-use warranties, vs the 2y from Stihl. They are made up to 81cc, but your
local HomeDepot won't usually stock them. (You can buy them at HD online, however....CS-620P is $650.)
The long-lived Stihl FarmBoss MS290 (57cc) has now been discontinued (replaced by MS291, 56cc). I have had
the MS290 and its predecessor, the 029, and both are OK, but don't have compression release, and cold start requires
full throttle-lock. I think the Husky Rancher 455 or 460 is superior in every way. Have not tried the new
Echoes.
But back to the OP's cheap saw requirement. I have just sent a friend off to Lowes to get the Poulan 4018, but
the 3314 is only $109 right now. They also carry Husky and Hitachi.