Buck and I have a Polder remote probe thermometer, which has served us well. Can't remember how much we paid for it. Probably less than $20.
I think, if I remember correctly, our instant-read one is a Polder, too. Not too expensive either.
Bought both at either Linens 'n Things or Bed, Bath & Beyond and used coupons to reduce the cost.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!