No, it does not cost anything.
Well you can pay money for it but you get it free on most websites, the easiest download is on the Minecraft forums.
It does cost money. but you can download it illegally
No. Demos for games do not cost money.
Minecraft forge is a free program.
No they don't.
no
No
Well, you need the game 'minecraft' which does cost money. Pixelmon is just a mod for the game 'Minecraft'.
Custom maps in minecraft can usually be downloaded for free.
$26.95
They cost memory. No money though.
No minecraft mods don't cost any money but it sometimes may be a project to get them.