Samples are by far the best way to try a new product without leaving your home!
Purchasing beauty samples on ebay is easy as there are plenty of them. Some people would actually prefer buying samples because they are so handy to just pop in your bag and hardly take up any room. That way you wont be wasting your money on a product that you dont like or are allergic to.
The main items that i would look out for are Top name brands, items listed as travel, mini, miniature, sample, trial, GWP (gift with purchase)
You can also get sample spray vials of top end fragrances which are excellent and are surprisingly last longer than you would think.