<shill>
~50 linear meters (~164 linear ft) of styrene rod for ~$7 to ~$12 depending on thickness:
https://www.aliexpress.com/item/100pcs-1-0-1-0mm-Square-Rod-ABS-Plastic-pipe-JYG-1-0-50cm-length/32240420663.htmlIgnore the "ABS" in description, ABS cement doesn't do shit but regular plastic cement works.
It's not as nice as Tamiya's Plaplate but decent enough for construction. Probably on par with Evergreen.
</shill>