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When I checked a couple of weeks ago they had the MiFis back in stock but according to their web site they are out again.
You might try the 3Gstore They sell the Milinicom plan and MiFis. It looks like all they have at this point is refurbished MiFis and USB modems. This is the first time I have seen that. You might want to give them a call - they have been very helpful to me in the past.
Milenicom no longer sells the MiFi. They use the Pantech 291.
They do not have an eta for availability yet, but they say hopefully no longer than 2 weeks.
They recommend http://3gstore.com/product/5117_millenicom_20gb_plan.html
You can bring your own device and just buy a sim card and the plan from them, or buy a compatible device and the service plan.
Here is an interesting and helpful article on the Millenicom devices and plan info.