National poly brood boxes...

[Haughton Honey]

Could someone please point me in the direction of any company that sells individual national poly brood boxes (rather than the full hive set-up).

I've had a look at the Swienty web site but it appears that the brood box as a standalone isn't on their list of available components and Wynne-Jones, who are about 35 mins from me, only sell complete poly hives.

Thanks