The Maverick PT100 is an instant read thermometer that "rivals" the thermapen. JMSeltzer did a review on the Maverick PT100 vs Thermapen which shows how well both perform.
The Maverick PT100 that you got for $100 is a lot more expensive that what you could of got it from amazon.
JM (Mancavemeals) also uses the Maverick ET732. I have one of them as well. They are great for the Meat Probe Thermo as well as Pit Temp Probe which you can put at grate level. You can get them from many different places. I would suggest getting it from 50 BBQ who is a brethren. He has fast shipping and great costumer service. http://bbqequipmentstore.com/NEW-Mav...732-ET-732.htm