I have some available to me, they are $750 a pair (right in line with Tony K T's quote) and he is also correct in the care and maintenance. They are nothing like chickens, typical pheasants, or chukars, coming from tropical rainforests on Palawan island in the Philippines and depending on the species places in mainland Southeast Asia. They can't take cold or dry air very well, and their diet is not the same as most pheasants, they eat a lot of fruit and leaves along with nuts so not only should they receive the regular pelleted pheasant foods but lots fresh fruit and nuts plus lots and lots of insects, especially if you want them to breed.
Grey peacock pheasants are endangered but still available through breeders. After you research how to keep them and you can provide the conditions to keep them healthy look around or contact me and I can get you in touch with people who have birds for sale.