>>3438226You likely won't find a lot of full frame cameras at 300€.
I don't know in which country you are located but I just had a quick look at French classifieds (
leboncoin.fr) and it won't even get you a D700 which is nearly 11yo by now (it's still pretty good though, provided that it has been maintained and not abused).
No D600 either at that price.
I could find a few Canon 5D (mark I) around 280/350€ but I have never used those.
Also found a single 1Ds Mark II (Canon's flagship from late 2004 to mid-2007) with a cracked screen for 350€.