Where to order DID's for transfer to VOIPo?

[VOIPoTim]

Can anyone recommend a cheap, online source to order domestic numbers?

Sometimes my customers want more selection than what we can offer through VOIPo.

So I'm looking for a secondary source for numbers only. Numbers would be immediately ported to VOIPo.

Thanks for any suggestions.

Keep in mind that we would have to have coverage in a specific rate center or we wouldn't be able to port in the number. So if you ordered a number from a ratecenter we didn't cover, we still wouldn't cover it when porting.