I picked up a used ATN NVM14 Monocular for $1,100 and when paired with an IR Illuminator, it's like green daylight, pretty awesome, putting both on a helmet. I still want a Thermal monocular I can also mount on a rifle.
Everyone's definition of what breaks the bank is very different, what are you looking to spend?
M&P-10+AAC Cyclone - Kel-Tec RFB+Griffin Sportsman Ultra Light 300
ATN OTS 336-70mm 60hz Thermal Monocular
ATN OTS 336-30mm 9hz Thermal Monocular
ATN NVM14 NV Monocular