I meant inexpensive in today's market, where these jugs can be easily picked up between £1-£10. Whitefriars, by and large, can only be obtained for that kind of money if the seller doesn't know what they're selling.
Although as I understand it (code for: 'I'm probably wrong, but...'), Whitefriars 'studio' pieces were expensive when first issued and these Scandi-style jugs, if they're quite commonplace now must have been even more so 30-50 years ago, and so quite possibly would have been retailed relatively cheaply (relative to Whitefriars' studio range, anyway).