I would suggest that you do not need another Traeger probe. You need a probe from a reliable 3rd party.
I used my Traeger probe for the first couple of cooks and have not used it since. For cooking large pieces of meat, I use a thermometer with four temperature probes that can be left in the meat. While you will see many recommendations for Fireboard, Meater, and Meatstick thermometers, they are rather expensive. If your budget will not allow for such an expense at this time, there are inexpensive 3rd party thermometers that can be used. They do not connect directly to the Traeger, but some do come with apps for your phone.
Your primary reference thermometer should be an instant read thermometer that can give you a reading within +/- 1 degree F in no more than 3 seconds. If you are planning on using your Traeger frequently, then getting a Thermoworks Thermapen might be justified. It is designed for use by professional chefs in restaurants. However, there are less expensive thermometers that will give you similar performance, they just might not be as durable in a professional setting. Be careful not to get one that has a response time greater than 3 seconds as you will soon find yourself frustrated when you are trying to take multiple readings in sequence with the Traeger lid opened. I have several older thermometers that are too slow. The ones I currently use are a SmartPro ST49 currently on sale for $20 and a ThermoPro TP620 currently on sale for $37. I do not know how they will hold up over time, but both perform so well such that I cannot say that I prefer one over the other. They are both swing open probes so they do not take up a lot of space in the drawer. When you close the probe, the electronics turn off to save battery life.