Heavy Battle Armor

I had my second session yesterday and my players wanted to go shopping for heavy battle armor and for some reason I thought that heavy battle armor wasn't as powerful as it is until after the session so now two of them have powerful armor really early on they do seem pretty happy about obtaining the armor but I would've rather they had gotten it later on.

I'm not entirely sure if I should let them have it and turn up the encounter difficulty or say they can't have it. Advice would be great ( I was improving and I had the stats on the gm screen but not the price/rating so I thought it wasn't too powerful)