Plumbing supply stores in Houston for atypical hoses/pipes/fittings?

I mess with my big aquariums a lot and keep finding that Lowe’s and Home Depot don’t have the right parts. For example, maybe I want metric or a 90 degree elbow with a 1 and 1/4 ID that is female threaded. Maybe I want a bunch of schedule 80 pvc. Is there a store in Houston that would suit my needs?