93-94, the retail on MetRx was $3.15 a packet. EAS's original Phosphagain, which was MexRx's competitor when Phillips and Connelly had their split was about the same price at $3.25, but Phillips threw in some creatine in the mix on that version. Phosphagen, the regular bulk creatine, was on special from EAS at $39 / 200grams in 94.
Just a few prices I was able to grab quickly.
I remember the creatine being under lock and key for years at our local GNCs.
Edit - The original Phosphagain because few remember it -
.
It was horrible stuff, came in one flavor, salty vanilla. Also for like a year or two, they shipped Phosphagain and Phosphagen HP in those crumby cardboard tubes. God help you in you spilt some water close by.