Wr250r price and wr250x conversion question

Hi looking at this wr250r 2016 price is 4400 euro/4900 usd, it has 11590 km/7 200 miles. Wondering if its at a reasonable price?
Would also like to convert it to a x for now cause i will mostly ride on the street, but there are almost never any wr250x on the market here in sweden. Around how much am i looking at to convert it into a wr250x? And is there a guide for this or what are the needed parts?

That's a reasonable price for a WRR in such an apparently good condition.

You pretty much only need wheels to convert the WRR into a WRX; Warp 9 still makes such wheels for the WRR, and they're about $1,000 for the pair. Technically speaking the WRX also has a different brake master cylinder, but you can try it with what you have and see if you're satisfied with the braking power. You will also need to trim the fork covers to clear the front tyre, or buy the WRX-specific fork covers, which are still available from Yamaha.