I also budget tire user....but budget means premium used tires...

For the price of a new nexen...can get top of the line tires thats about 80% above usage.
Get only those 2010 above....but most of used tires I buy, the rubber harden a bit, its gonna be rowdy for the first 1K Km...
Do check the tire strictly especially the inner parts. Sometimes need to use torch light (handphone light also OK) to check it. Check for sidewall damage and cracks, sidewall must have No damage.....If got 1 puncture patch in the middle tread still OK.

But thats me...

Yes, 17s tires cost above RM600 new each....X 5 (usually, the spare is also bulging!..thx to potholes) is RM3K!
Then, when you are driving, go into another pothole...there goes another tire!

But I'm not promoting used stuff....this is my personal choice
Used tires also got problems like rubber harden, rowdy, dun have that 'new' feeling, finish faster etc
But after 1 months the tires will set in and feels better

Of course buying new prime branded tires is the prefered (if got the money)