Where to get 12AX7AC5 HG+ 678 ?

Hi all! Looks like Laura @ valve queen is out of these tubes. Any other places to try? Dougstubes has it but it doesn’t specifically say 678? Thx!
 
StewMac started carrying Ruby tubes, including the 12AX7 AC5 HG+. I forget what the trailing number (678) means, but I believe it's not a make-or-break specification, more like just a reference number.
 
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