I jacked up the car today to see where my slow leak was coming from so I could patch it up and saw that the tires are all ssot and that one of them has begun to crack.

I would by all new tires, but dont want to buy 18" tires when I will be getting 19" wheel around the end of summer.

So i am looking for the following sets (or even one) tire:

If they are 235/35/18 I only need one. (this is the size I currently have)

If they are 235/40/18 I need all four (quattro-have to keep the rolling distance of all tires the same)

Can be brand new or used....not looking to spend to much, just need them to last me another 2-3 months

THANKS!