Italeri does an MH-60K which is modified from their base UH-60A kit.
Hasegawa and Idea do the HH-60D; AFAIK the Idea kit is an unlicensed Korean copy of the Hasegawa kit, Hasegawa also re-issued a modified version of this kit as an MH-60G with DS markings.
There is also a Fujimi kit of the HH-60D prototype.
All of these kits are relatively common on EBAY and at model shows.
""Expect nothing - that way you won't be surprised when it's precisely what you get.""