Lots of people with good luck on LKQ also look around on the forums and of course junkyards are a good place but your going to want to try and use ones which have a guarantee on their parts. These motors are pretty solid though you shouldn't have to roll the dice too bad. Depends on what you can find, a few years ago it was a lot easier, but now it is such a popular swap that these motors are a little more difficult to find and have a higher price tag. You shouldn't pay more than 2k for the combo as long as the miles aren't super low. Also try and get a 2001 or newer if you can due to the fact that the older models had a longer crank issue.