I went to Walmart for a Halloween costume and....

Hey Hey Hey!
Me and one of my besties went to Walmart yesterday to look at their Halloween costumes. My town is little, and we have Walmart. So my friend and I went together because we thought it would be fun to try on costumes together and maybe even get matching costumes. So we're in walmart. We see cute costumes. We picked up a bumblee costume and a ladybug costume and go to the try on place. And we couldn't try them on. We were told that we can buy them and try them on at home and return them if they don't fit. We took the costumes back and put them on their hanger things and went to the makeup section.
I think it's stupid that we couldn't try them on. I was really pissed. But I really really really want an actual costume this year!! For the past 2 years I had devil horns, and red shirt, and a black skirt. And I was a devil. That was my costume. This year I want an actual costume.
I don't know if I should just buy one and then try it on at home. I don't have anywhere else to get a costume. I've seen such CUTE ones on the internet, but I can't order any online. :(
I'm so sad becuase I really really really want a costume!!!