I need to construct an underground valve box to house my Bottom Drain
shutoff. I was originally thinking painted/fibreglass SonoTube, but the guys
over in Home Repair suggested ABS, which I thought would be pricey. But I
see that they make something called a Curb Valve Box for just such usage.
Although I couldn't find one for retail sale.

Any bright and cheap ideas? Valve will be 4 FEET down BTW.