MNScuba.com

An Inspiration-friendly Cozumel dive outfit:

They offer cylinder rental + 200 BAR O2 & He fills. They sell 812 scrubber material @ $35 USD per fill (might want to bring your own).

It is run by Oliver & Janie Robertson, and although I haven't stayed at their place nor have I dove rebreather with them yet, I have dove OC with Janie. She's a very competent diver and has logged 1000 + dives in Cozumel.

Ouch!! $35 a fill for scrubber. I'd seriously think about bringing my own.
:o

Yeah, I know! But cylinder rental is only $5 per day (or $10 for dil & O2).

I'd like to find out what 'technical' dives exist in Cozumel . . .

There are some reefs there that get pretty deep. I've visited a few of them but was restricted to no deco limits, only a few minutes there. It'd be nice to spend a lot more time. Devil's Throat and Santa Rosa Wall were some of my favorites.

Was the 'no-deco limit' imposed by the boat or is it a Cozumel 'law'?

I'm pretty sure it was just by the boat we were diving with. Sounds like the operation you found might be more likely to let you do longer dives.