As any well informed local will attest, Mary's Place is all but impossible to dive with any reputable dive op in a one day visit.
Sure- I am certain that many have done this on the sly, but for a dive op to be legit and comply with the use restrictions for this dive site, you would have to sit through the 25 minute video, attend a dry-land briefing (that by curicullum is 40 minutes long) including site specifics as well as buoyancy tips.
In that it can be a fairly deep (85') dive, it is precluded further from legit visits in that it is to be done never as your first dive on any given Bay Islands trip- the DM's are supposed to have time to look you over, offering any assistance with buoyancy.
Any op that will take you there, bang-out-of-the-box should be viewed with great suspicion. The dive is never to be a drop off, always with assigned mooring times, but lots of tourists come crashing down unexpectedly. Charter with care!
That said, Mary's Place is truly the Coor's Beer of diving. For years, you couldn't get it. Now that you can, maybe there are other goals? Yes, even in the Bay islands, absolutely there are!
Hard to get to, served only be a few resorts, is a much more interesting piece of u/w architecture, Calvin's Crack. But... easy to get to and lots of fun? The Prince Albert Wreck which sits in 35-65 feet of water.
Mary aint all that, certainly no bag of chips. Don't make your life dependent upon diving it. Time better spent elsewhere on the S side with an attentive DM after you explain to them that you want to do a 45' dive for 1:10 and you want them to show you SeaHorses and stuff no larger than that. This is what you come to the Bay Islands to see! Enjoy the details!
and yes... Kimber (and Mickey/Airhog)... dear old pals of mine.