Cabinet Samples

http://www.cliqstudios.com/kitchen-cabinet-samples

Only offers 2 free samples but I mean how many do you really need?

Upholstery samples

http://www.discounteddesignerfabrics.com/index.php

Every kind of fabric you could ever want!

Tile Samples

http://www.daltile.com/

Tons of tile! Great quality too!

Builder Samples

http://www.builderelements.com/

This site has lots of random samples from tile, to floors, even kitchen cabinets!

Furniture catalogs

http://library.interiordesign.net/

Great side for inspiration or finding specs for exact products, has TONS of choices!

Paint fan color decks & samples

http://sherlink2.sherwin.com/resource/ctools/login.do

Make an account on the sherwin Williams page and you can order paint catalogs and samples all for free!

Hardwood Floor Samples

http://www.andersonfloors.com/

This website is slightly confusing but they still provide free samples.