welcome to the coal forum, our good friend William's forum name is wsherrick here and he has indeed helped teach the world including me a lot about antique stoves. The main problem now is the price seems to increase and the supply seems to decrease each year on these (their are only so many out their that are viable restorations). The good news is they are still about the same cost as a brand new coal stove produced by the thousands (so still a bargain in my mind!)
Their are many different types of these old parlor stoves and even though they may look very similar... with flashy nickel, mica doors, top finials, etc. they can be vastly different in design, function & efficiency. The trick is to read lots of threads here on the forum (type in the search box top right of screen, things like "baseburner" or "parlor stove" or "antique stove" and start reading), we have Dbl heater type, baseburner type, oak type, direct vent, 3 sided mica, etc. and then to define it more than that we have different designs within each category! Ive found that direct vent, Oak type parlor stoves are available 100x more than a true Baseburner style parlor stove, I find the very ornate Mica stoves seems to cost more money than a good functional Glenwood Baseburner for example (I guess theirs more buyers for those super ornate mica stoves and 90% of them will probably not even fire them up).
If your planning on buying an antique used then you really need to learn what to watch for because 99% of those old parlor stoves on creigs list aren't worth 1/10th of what they ask for them and you would be far better of going to a stove shop and buying one completely reconditioned for $3,000 than to buy a used/unknown one for $1,000 only to find out its worthless and cant be repaired without spending $5,000 more.
I guess these are some basics to get you rolling... hope it helps.... now gogogo... to the search feature on the forum