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You should expect to pay about 1800 to 2000 per ton so the 3 ton would run between 5400 to 6000 and the 2 ton 3600 to 4000
Now with this said, there are going to be a lot of variables. This would include furnace coil and condenser for the 3 ton and air handler and condenser for 2 ton.I recommend doing all at once.
If you keep old furnace on 3 ton deduct about 2000.
Also price is going to vary between brands as well as contractors. For example A Trane or Lennox will be higher than a Goodman or Rheem.
A small company with 2 or three techs will be significantly lower than a company with 12 techs and 2 office personel due to overhead.