On-Semi was the last major seller for these SCR's and discontinued them a couple years ago. I bought about 15K of these when On-Semi listed these on LTB list. I still have just over 6K remaining.
Since then - Central Semi has taken up the slack but at increased prices.

Littelfuse has taken over several product lines of SCR's and include some that are rated close to the 2N5060 series. One of these days - I gotta figure out which is closest to the 2N5064. Surely gotta be cheaper than the Central Semi parts.

Lastly -- damn, I love being on vacation!