I had a couple of those LRP AI Super Reverse when I picked up a used Associated T4 truck from eBay. THose were the worst ESCs I've ever used. I had the "forward one time" then "reverse the next time" syndrome because of the autocalibration. I say they are throw-aways if you can afford to go with new ones.

You may find some used cheap brushed motor ESCs on eBay. Anything from any vendor who offers calibratable (one-button setup) type ESCs would be fine. You will find dozens available due to the plethora of people going to Brushless racing or driving and selling off their old stuff.

Could you get by with other LRPs too - the Quantum is one that is a brushed controller but doesn't do the AI stuff. Some older hobby shops may have some laying around they'd offer you at a discount (to get it sold).