Go to ebay, there is a person on there who makes em and they cheap too!!
Now this is a simple suit, not the mega major ones, but there is a guy on there selling one for about 1500 which if your looking for bigger better might do.
If you google mascot uniforms or mascot costumes and also chearleading outfits you will find them they sell for around 500-2000 depending on what style adn size looking for. We were going to buy one last year but was way to much so we made our own cost $175 made of foam and cloth was a big hit at little league games.