You will see heaps of them going cheap,both new and 2nd hand UPVC.
Also drop by a few glazing companies and their production factories.
You will often pick up a miss measure UPVC window for hardly any money.
Well its actually not a year old yet,but theres no harm to reply to it anyway.
My post has some usefull advice for anyone else in the same situation who might be searching the forum for an answer or solution.
My door and 3 windows for my garage came as miss-measure items from a large UPVC window company.Got the lot cheap as chips.UPVC window company were more than happy to have them off their factory floor and I got a brand new door and double glazed windows at a fraction of the cost.