Using sprint phones with non-sprint service

I have an interesting problem.

I need to test some phones from Sprint for a project at work. I was given the phones (MM A900, LX350, and FUSIC) and I need to find some way of getting them activated.

Here's the deal, though. I only really need to use them for a day or two to make a few minutes worth of calls each. For other phones and services I've gotten them set up with pay-as-you-go plans, but Sprint doesn't offer this and someone else ordered the phones so... here I am asking for advice.

So, what's the cheapest way to get these going for a week without incurring a contract or big expense?

-Moose

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Some independent cricKet/JabberJaw Moble dealers will "flash" another providers phone to their service. I have cricKet service on an old Sprint phone. For Sprint my guy charges $35 because it is Sprint plus $15 for "flashing". I'm sure once you found a dealer to do it you could work out some deal on the price.