Hi,
First I'll give my approach regarding amazon thing as this application is mostly done.
I've done one application from where you get the best selling items from amazon. So once you select a particular category, the application gets top 100 best selling items under each sub category and then it will show all the listing on your screen.
And once you select the items to be uploaded on your website, those item information will go into your database.
For checking discontinuation of items, another application will check all the items on your website with the amazon thing and if some item on amazon is out of stock, that item on your site will be out of stock.
I'm ready for further discussion regarding this work.
My sk pe is
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arnab01
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Thanks & Regards,
Arnab