Power cords for Coincident Frankenstein and AMR DP-777 <100$

Essrand,
I appreciate that  we all have our individual budget limits, I'd offer this advice. Wait and save more money and buy high quality cords on the used market. Your Frankensteins are high resolution and transparent amplifiers.  You'll easily hear the benefits of the higher  quality power cords. A 100 dollar power cord could be a relatively good value choice but may not extract all the performance your amplifier has to give. 
Charles, 

Nonoise,
Thanks for your kind comments.  You're right I'm advising based strictly on personal experiences. Without question 300b tube choice influences sound quality  (I've heard 11 different 300bs in my amplifier ,numerous generous loans). I just believe that people often underappreciate the value of good quality AC  power. 
Charles, 

Hello Essrand,
The Black Treasure 300b is a very worthy tube (I used them happily for two and a half years ). To better them you'll have to spend more money. For what you'd pay for better 300b tubes that money would get you two good used power cords and a good AC wall outlet  (they make a difference ). Definitely various reasonable routes to consider. In my opinion addressing the AC power (power cable, outlet and upgraded fuses ) is fundamental and money well allocated towards towards improving an audio system.  Choices 😊
Charles, 

Hi Thaluza,
Thanks for your insightful comments on the SR  Graphene and Cerious Audio  Graphene power cords. These two new products are very interesting as well as reasonably priced. It makes me wonder how they'd compare to the Coincident Statement power cables. 
 Hi Lak, 
I left a comment to you on the Cerious Graphene thread. 
Charles,