Google-sheets – Auto bracketed pricing in Google Spreadsheets

I am keeping track of some sales in a Google Spreadsheet. I have a price bracket for number of items sold and unit cost (so that people ordering in bulk have lower prices).

I used to just have about 8 nested ifs, but thought it better to have an entire sheet dedicated to this kind of bracketing instead.

How would I go about writing some kind of formula to determine a price based on a qty? Example pricing sheet:

In Ruby or some other language, I would loop through until I found a min qty bigger than the order qty, then backtrack one step.

I'd like to avoid the Script Editor if possible (it seems to me that it may be difficult to have scripts and formulas running side by side on the same data).

Cheers.