Here’s a fun 21 dollar army:
Six 6 tank, 3 infantry stand T-55 battalions, the infantry riding the tanks.
Three T-55s converted to bridgelayers.
Three T-55s converted to armored carriers by dremmeling down their turrets (good luck with that, btw).
Three engineer stands.
Alternatively, cut off some of the T-55s’ barrels, add on a bit of short plastic tube and make them into an infantry support variant.
We get slapped around, but we have a good time!