Not a lot of them around since the military do not use as much hf gear as tactical vhf so prices tend to be higher.
I have a PRC-104 and have just completed assembling the components for a GRC-213A.
Mike Murphy currently has both the 104 and 104a available - and not cheap. But good gear. He also has the URC-113 if you are thinking of a vehicle installation. He also has some of the NVIS bases for ground mounting the NVIS antenna.
I think I have an extra of the "umbrella stand" type amidst all the green stuff in the basement.
On the other hand I saw a GRC-213 with the rt-1209 at a military show last weekend for about $1400 and I understand that someone got him down from that price at the end of the show. If I'd had the cash .... oh well.
As usual, the great deal ... was just sold.
I will be uploading some of the manuals for these radios in the next week or so.