[Asterisk-biz] Truly Unlimited DID's

[Asterisk PBX]

Hi,
I am looking for DID's with unlimited incoming and unlimited channels. 
Most providers don't charge much for the DID but they then say that 
there is a "normal usage patern". If one go's over then the price can 
jump. There is no telling of what it will go to. I am looking for a 
provider that can give me DID's at a set rate. Some of them will have 
heavy usage while others will have very minimal usage. Thanks.
David
PS Oh forgot to mention, US DID's