Thanx... Yeah, no luck on the Exchange. I'm a Cmdr 2, so maybe I'll be seeing one soon.
I just bought two Blue ones for my Klingon at Commander rank last night. They were 370k+ each. And they had green and white ones available too, green for slightly less at 320k+ each, and white for 170k+ each. There were plenty when I was searching for them. Are you sure you're searching for "EPS Flow Regulator"?
I found two worked best. At least in a Fleet Escort.
For my escort and BoP, I use all cannons in the front, turrets in back. For my cruiser, two dual beam in front, rest all regular beams. If EPS still affects weapon power, I might have to use more than you if you run some projectiles.