If St.Johns, try TradeEx and keep your fingers crossed. Hopefully somone will chime in from your part of the country.
Frontier Firearms sometimes has "free shipping" on cases of ammo.
To contact Milarm, just give them a call, but they will probably hit you with shipping.
West Rifle is good too, but I believe they would hit you with shipping.
I picked up the crate just a week or so ago as it is starting to dry up again. Three years ago it was common, then it dried up for about a year and for the last year it has been common again. Same with the Tokarev ammo (also picked up a case) and from what I hear soon to be the case with the 7.62x39, so I hope to pick up a case or get some of the Czech non-corrosive ammo which just came in.