You can buy new registration numbers from DVLA Personalised Registrations.
Registration number auctions
DVLA Personalised Registrations also auctions some exclusive registration numbers. Auctions are held about 6 times a year and reserve prices start from £130. You can see a list of the numbers coming up for auction online.
You can bid in person, by phone, in writing or online.
Buying from a private number dealer or private sale
You can buy a personalised registration number from a dealer or from a motorist in a private sale.
Make sure you receive the V750 certificate of entitlement or V778 certificate of retention.