I am in the planning stages of a retail store, general home decor type
stuff, and would like to sell a few related magazines at my store. 
For example, Martha Stewart Living, Simple Living, House Beautiful,
Food and Wine, etc.  I would only need maybe 10 copies of each per
month.  How do I go about this other than by subscribing to each 10
times?  Are they sold to me at a reduced price and then I sell them at
the cover price and then what do I have to do with the unsold copies
at the end of each month?  Thank you in advance.

You may want to contact a service such as Ingram Periodicals:

http://www.ingramperiodicals.com/

www.andersonnews.com