Amazon & ebay auto feed product feed import

I have excel file extractor that I used manually to extracts feed from my one of my vendor feed to used for my eBay and amazon web store and pro seller account. I will like to add to more feed (ftp feeds to be automated in to 3 = 1 one feed and send to amazon and eBay stores. Every night at 12am. I would like for the script to process the item bought from amazon and eBay back to distributors I buy from. I need person to also created create a script to compare price to save money. Expert ideas are welcome I need this done in a week.