4 x $24.75 NZD
Instant Bank 
12 months interest free Adjustable Bend for Wood Fire Flue - Stainless Steel
These are designed for Wood Fires, Gas Fires and can be used for many other purposes also -such as ducting etc.
(The standard size to select for a Wood Fire is 150mm.) It can be adjusted so it provides an offset, or it can be made into a right angle - or you can add two together as well.
Adjustable from 0 - 90 degrees
4 segment up to 400mm
5 segment from 450mm to 600mm