I have several WB lightweight rugs and one that has to be about 10 years old and still going strong. also have a masta lightweight but have to say prefer the WB ones. try www.equestrianclearance.com they usually have very reasonably priced rugs.
I have a lightweight masta, quite cheap and fits well but imo they come up a little small in length also not too good if you have a very wide horse and they are not very deep.
I love my Weatherbeeta Jasper Extra Lite, it's a 6'5" so they were selling it off really cheap!
I have a mediumweight QuiltMasta, and TBH if the lightweight Masta is anything like it, I wouldn't bother. It soaks up EVERYTHING and stinks to high heaven!