In British English, especially in commercial usage, 'spend' is very often used as a noun, meaning 'sum of money spent (or to be spent)', for example, a shop may have a sign next to the till saying "£10 minimum spend for credit card transactions".
It is a modern thing and I personally don't like it, but that does not make it wrong.
Here is a blog entry about a pub's party facilities:
Quote:The Bear can accommodate 200-250 people. There is no hire fee required " simply a minimum spend: Mondays to Thursdays £2,000; Saturday £2,500. Parties can bring their own DJ. The Bear can supply equipment. The Bear is licensed until 12pm but it is possible to apply for an extension until 2am at a cost of £50
Remarks on Bookseller.com about Amazon's delivery fees:
Quote:Amazon.co.uk is planning to reduce the minimum spend required for orders to qualify for free shipping from £15 to £5.