What do i need to do a flip back/front/wall?

ive seen all the videos on youtube about spoters and stuff but i dont have the guts until i no theres something underneath to catch me when i land/fall. what are those things in the gyms those giant thick pads can u give me the name and where i can find it cheap. any advice. have u done it before. cani prac a wall flip on the netting of a tramp first. thanks