You can try Craigslist or a Habitat for Humanity Restore - both often have unused good quality fixtures etc.

Costco carries that sort of stuff, good quality brands for less, I got my shower stuff there, can't even remember how long ago.

Tooky is right on with that. If you have a membership though, $75 a year. I buy all my faucets and lighting fixtures from there for majority of the homes that I flip. I need decent quality but for far less then the box stores. Just for instance a mid grade kitchen faucet at home depot will run you around $169 and at costco you're looking at $89. Lighting fixtures as well. The thing is you have to go in the stores, they are actually more expensive on line. Odd. It is a hit or a miss. That stuff sells out so fast. I literally buy pallets of stuff when I go shopping there. Their glass and marble mosaic tiles at $5 a sf when the same thing sells at home depot for 12-15 a sf.

Looks good. Way to go.