Cr2032 to AA battery power

So time ago I came across a nifty device that enable you to power a red dot scope that was normally powered with CR2032 coin batteries, with a pair of AA batteries in an external box. The unit consisted of a CR battery compartment screw-in cap/adapter, a short cable, and a small AA battery box. It was available in several different screw-in cap versions to fit various brands of red dots. It cost about $15-$20 IIRC. Unfortunately I didn't bookmark the source.

Does anyone know of this adapter and its source? So far I haven't had any luck relocating it.

Haven't seen that type of battery or adapter pack. i don't know how it would marry up with all the different styles of caps or covers though.

The unit was available in about 4 or 5 versions with caps to fit various brands. The mentioned BSA and NcStar among them. I wish I had bookmarked that site.

I'll keep my eyes open.