Yamaha DT250 purchase advice

Hello, I recently fell in love with a DT250 of the series 512. I find the part so pretty that I have serious interest in getting a bike like this. So far I am on the road with two motorcycles from Royal Enfield. I also find the first 3 series of the DT very handsome. What about the spare parts supply? Is there an online shop or something like that? Are the different series from the engine identical? I found a 512 which I like well. However, the previous owner can hardly say anything about the condition, would have driven only 2-3x in the last years. Since I don’t have time for a overhaul, I rather look for something that gives me long joy without repair jams. Think you can hardly say from a distance how it stands around the bike, depends on how much that has been heated through the terrain… What is a good price for condition 2? VG Lennart