Excel and "Real-time" feed
 

So I am putting together this e-commerce website, my wholesellers have their
products on a "real-time feed" to update inventory, etc... although I am
still updating products and have yet to install the shopping cart portion of
the site I can't help but wonder HOW? If I have to upload my products through
Excel 2007 in either .cvs or.xml format, then from there copy and paste to my
actual website for purchase how can I link Excel (or any other program???) to
"real-time" on my site. Of course I will be supervising the site many hours a
day, but I really don't want to sell something that is no longer available. I
am wanting to make sure that before I open my doors I know when the
distributor runs out of an item, it is immediately hidden or removed from the
site. Any ideas on this?
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Thanks for your time and God Bless!
Pam