Plain kilt jackets (no fancy cuffs or epaulettes) have been around for ages, but appear to have been gaining favour in contemporary times. As people have already mentioned, such jackets are known by various names. One might search for "Wallace jacket" or even "contemporary/modern kilt jacket."

For less than $250, you're probably looking at used or ex-rental. Another option are some of the slim cut suit jackets and sports coats that have been in style over the last few years. For example, I bought one at Forever 21 that meets the requirements of being a kilt jacket, namely that it is short enough to not cover the pleats of my kilt and has a bit of a cutaway for the sporran. You can read about it (and see pictures) here: http://www.xmarksthescot.com/forum/f...ket-pic-84301/