You my have seen the Sportacus outfits in Argos - good value at about £18 but beware ...
there are 2 types of outfit - one is just a top, cuffs, hat etc and of course stick on moustach - these are the ones here on good old ebay and also in Argos at about £18
The other is a whole suite with hat, goggles etc. This is usually called the 'delux' outfit. These go for various prices on ebay but you'll be lucky to find them elsewhere. There is much more to them and maybe worth the extra money.
Hope you find this helpful.