Best way to create temporary windows ec2 instances with pre installed apps?

I use windows ec2 instances and I need 2-3 tools which I need to install. I ocassionally need 20-40gb hard disk for processing and I always know what HDD size I want before lauching the instance and I always want the tools when I lauch the instance.

Problem is, I need to use it for like 1-2 hours only. Maybe 3 times a month.

What is the best way to tackle this with less price so that I can lauch with the pre installed apps as fast as possible with cost effective way?
(processor and ram could be any)

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Author: LotusORB