CorSec Engineering has just released a 15mm scale Barrier Fence:
From their website:
Each section is designed to clip into the next one to create a continuous fence. 3″ clear acrylic rods are optional. Great for keeping out bugs and dinosaurs!
Without Rods – $1.49 per section
With Rods – $1.99 per section
Sections come unpainted and unassembled.