Where can I buy inexpensive stuff to sell?

If you order from outside the usa remember you may have extra tax to pay.. I have used this site in the past, you can find suppliers that let you order low amounts to get you started, they may call any small orders samples just so you know..alibaba.com

You could buy pasta and other healthy ingredients in Italy, where their price is lower than the rest of the world, and sell them in USA, where italian's cuisine is pretty appreciated. And really expensive.

things may be cheaper, but unless you plan on drop shipping, you'll be liable for shipping and all import duties to bring the items into the US. and on items like furniture that could be excessive.

the internet is full of places that sell all kinds of stuff, start searching