Where is the best place to find a motor for a 2001 Alero with the 2.4. With a vin letter T. What motors will fit into the alero?

Looking at it from the other way around, I put a 2001 - 2.4L vin letter T in a 1999 with the same and everything went in fine. I just had to get an O2 sensor for the 1999 since it was not compatible with the one that was on the 2001 motor. I have about 6000 miles on it and all is well. I had gotten my motor from a local salvage yard for $300. The donor had been in a bad front end collision but was running and the odometer had about 26600 on the clock. I just had to pull it myself.