Future-Nine charge a $20 porting fee and $3 per month unless the number happens to be in NY, CA, PA, VA, WV, DE, MD.
I suggest just go with Anveo and be done with it. Reliable service, great price.
DPC3825 (bridged mode) - WRT610N + Tomato - Panasonic KX-TGP500 - Asterisk 11.0.2 on Virtual Server
Anveo - FreePhoneLine - Voxbeam - Numbergroup - Callcentric - VoIP.MS - Localphone - UKDDI