Well, I agree with the look long and hard, and don't rush in approach. But I have to say that FH's views are definitely his own and certainly not shared by everyone.
Ebay can be a good source once you've learned to see past the flim-flam that is understandably part of the process; estate agents' sites ARE a good source of property, especially the main Bulgarian-language ones.
As for the question of what is a good/fair price, that's a very subjective thing. From the details on the web site the property in question certainly doesn't appear to be over-priced and it's definitely a better way to go than buying some cheap house and spending a fortune doing it up, especially if you're doing it at a distance. Be a bit careful over the garden, though; unless you're going to live there permanently you'll find it a real handful - and stuff here grows more quickly that you can believe!