If you're looking for PVC fittings then Lowes has a great selection. The PVC fittings for compression brass fittings, flexible fittings, iron pipe and fittings, PVC pipe and fittings, tubing, speciality drainage or sewer pipe and fittings are wide and varied. From various brands in many sizes and styles like round fixture box, deep outlet box, conduit adapter, elbows and more. Mono-Systems
White Round Fixture Box
1" deep
For use when hanging lightweight fixtures
Surface mount or to an existing box
Paintable, durable PVC
ETL Listed 
Mono-Systems
Almond Conduit Adapter
1 1/2" wide
Connects base channel CH51 to 3 1/4" or 4" outlet box
Paintable, durable PVC
ETL Listed 
the pvc fitting is found at lowes.com
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