The baffle plate itself is not a 'high tech' item, it just diverts the air flow around inside the stove.. BUT it is welded to the two sides and back,, the expansion and contraction of the baffle plate HAS on at least one member's stove caused cracking in the side plates of the stove.
So take a close look at the sides of the stove where the baffle is welded in place.. look on the outside to see if there is a bulge or depression where the welds are and a fine hair-line crack. If there is not any visible deformation or crack, the next issue is the [maybe] warped grates.
To check the grates, with the firebox empty, move the shaker handle full travel both ways.. the grates should not bind against each other or the sides.. if they do, then new grates are in order, and a set of grates will cost as much or more than the stove..
If you don't see any cracks, and the grates move freely,, and you are handy or have a friend who is handy and can weld any possible missed cracks.. I'd say yo could gamble on the stove and coal.. Depending on where you and this stove are located, $300 may be what a ton of coal costs, and if you can get by with the stove for this season, then over the summer you can repair/rebuild the stove to near-new condition.
If the stove is safe, no cracks, and functional, shaker grates functional, It's a reasonable gamble. Most stoves in pristine condiiton will be around $1000 + right now.