Trenchers $85 here.. 12-3 wire about $275-$300.. Conduit is about $.25 a foot give or take.. 4x4 around $5, GFCI matters how fancy you get $5-$50, glue $5..
There you go, I'm getting ready to trench 500' of line to my aerator..
I believe in catch and release. I catch then release to the grease..