Well, there's many choices for lung hitters.
The Odin is really good, but there are others. Another popular atty is the Nuppin' - made by an ecf'er named pdib - but it's out of stock at the moment as well. There's a good thread in this subforum all about it.
Of Rob's stable, the RM4, 5, and 6 (especially the last two) are geared for DL
vaping, and there are fans of all of them. Prolly the RM4 is the most widely adopted of the three (but the least "pure DL", as it's air can be closed down for decent MTL
vaping). Prices are great, and they're all available immediately.
The range of available bottom feed modded atties doesn't stop there, either. There's a chap named Chowderhead1972 who bf
mods atties for use on squonkers like the reo. Here's a link to his thread which contains info on his current stock as well as upcoming runs of atties he's working on:
http://www.e-cigarette-forum.com/forum/modder-accessories-supplier-forum/581604-catfish-atty-mods-762.html#post15110691
There are a lot of 22mm atties suitable for DL vaping available through that route. The current hot ones would prolly be: Mephisto, Derringer, N22, Rogue, Marquis, Veritas, and Dark Horse (arguably, the mac daddy of big air atties).
It's a vastly different landscape than it was 6 months ago. Your timing is impeccable.