Showa Note (the same company behind cardboard samurai armor) are releasing a set of cardboard Vegeta costumes for kids and adults. It’s the perfect middle ground between high quality Vegeta cosplay and something like this.
Apparently, the kids’ outfit will go for 3,480 yen (US$34), and the adult version will go for 3,980 yen ($39). Both will go on sale in Japan later this month, and I wouldn’t expect an international release anytime soon. So, get yourself a refrigerator box and follow the lead of the “something like this” link above.