Finding plumbing parts for aquarium

[stellarfly]

Hi felllow reefers,

Went to Home depot the other day looking for PVC pieces trying to find plumbing for the aquarium. I found the section and it had a lot of the pieces that are common such as 90 degree elbows,45's, T-fittings and the such but I could not find things like gate valves, ball valves, connectors and different other fittings to make a durso. Where in Edmonton, AB does everyone get these sort of pieces.

PS. Im trying to avoid interent shopping for a damn gate valve etc!

Any options