where can one buy makerslide?

I've looked all over the place. I only need a couple of pieces (600 mm long), but can only find it by the ton (literally). any help would be appreciated.

 

i was hoping to escape the inventables high prices. but if i must....

 

I did, but I had to make so many adjustments, and had new plates made twice. I decided to go back to the makerslide. I wound up getting the 600 mm pieces that I needed from alibaba.