The .PW registry which is billing itself as the The Professional Web, announced this morning that after the completion of the Sunrise and Land Rush Period .PW domain names are now in General Availability meaning that they are being registered on a first come first serve basis.
Over 100 ICANN accredited registrars are taking live registration for a .PW domain name.
As far as cost goes I see one at least one registrar, Encirca.com is registering domains for as low as $5 for the 1st year with regular registrations at $11 a year.
DomainMonster.com is charging $9.99 per year for a .Pw registration
If your a registrar feel free to leave any pricing info in the comment section