In my 20-odd years of PC building and DIY electronics hackery, I have attached refrigeration units to many things: overclocked CPUs, of course, the underside of a mousepad during a particularly hot summer, and once I even made a hand-holdable single-beverage cooling device. What I've never even thought about doing, though, is strapping a Peltier cooler to the back of a digital camera to capture higher-resolution low-light photos.
For €2,190 (£2,000/$2,400), the Italian company PrimaLuce will sell you a Nikon D5500 DSLR with a dual-Peltier cooler strapped to the back, called the Nikon D5500a Cooled. In addition to the cooler, the modified camera also switches out the standard low-pass filter in front of the sensor for something that is specially tuned to be more sensitive to astronomical wavelengths of light (specifically H-alpha deep red). In case you were wondering, a normal body-only Nikon D5500 currently retails for about £400/€500, so you're paying a fair ol' premium for the modification.