I, too, have a hankering for conch -- in its myriad delicious incarnations. I have improvised in the past using "scungilli," which is a type of whelk, and imagine that calamari will work well. But if you want the REAL thing and just can't get it at your local seafood store, you can order it online from www.epicurexpress.com
You can also buy pre-made conch fritters and conch fritter mix from EpicurExpress, and they are quite good (though not as good as the real thing...)
I just ate some of my homemade conch chowder last week...
[This message has been edited by Sailor Girl (edited 08-12-2002).]