I learned this from my dad... When I was young, we had a plumbing leak on a Sunday night, p-trap was leaking. All places were closed, so he went to a McDonald's bathroom and stole theirs to replace ours.
20 something years later, my faucet was leaking. It was a discontinued model from a brand owned by home Depot, though they still had the display model up. Remembering what my pa did, I took the display model apart and took what I needed.