This costume was built as cheaply as I could make it. Many of the components came from local thrift shops like Goodwill. You should be able to find suitable materials to replicate my work.
There are a lot of steps, so I will break them up into the major components.
Step 1: Mega Man's Helmet (Materials and Tools)
The first step after I got the helmet was to extend the back/ears and add details like the widow's peak to make it look more like Mega Man's. But first here is a list of Tools and Materials that I used to create the helmet:
Hot Glue Gun
Heavy Duty Scissors
Hot Glue Sticks