The Lavatools Javelin is the fastest cheap thermometer available on Amazon. It’s not as fast as the Thermapen and it’s not as nice or accurate either – but you can buy 4 of these for the price of the MK4 Thermapen.
The Javelin instant-read thermometer is a great value and perfect for probing backyard burgers and steaks. I’ve been using mine without issue for 16 months.
Currently $24 on Amazon Prime