There are FLIR consumer devices with 320x240 sensors, like the E8, but they're a lot pricier, and low-FPS due to ITAR. Consumers in the US can buy 60FPS FLIR monoculars as well, but they come with ITAR restrictions.
The T2S+ seems to be 256x192, 25FPS. Still a bargain, if you ask me, even if it's not as sharp.