if u want a prefab box go to the flea market and buy one (cheapest route) nothin wrong with that. if you want something nice that is designed around ur wants and space, it cost a lil money. figure 45-60$ for materials and someones time in design and building and 75$ isnt alot of money. id say the built box is gonna sound better than the prefab hands down. this is my opinion tho take it as you want-