drilling and over flow boxes

[Ultimatom]

Hi guys ! Im new to this hobby , got my self a 55g tank and im in the process of building the stand. Im prolly gonna diy the sump and the overflow system too. I wanted to go with a bean animal type of overflow but i dont know where to get the box of the overflow here in red deer. Ive look at the link someone posted up here but those box are way too expensive and from what ive seen they're not bean animal systems. Any suggestions ?