Need someone who can write custom script/program

Hi I have a retail website. I like to automate daily price file
download and price update. Products listed on the site are shipped from
four different distributors.

So the final program will download price files from distributor
website, read mapping file to determine which distributor file to read
to update a particular product. Then update price and inventory in a
existing price file. Generate report of products with zero inventory or
low inventory or irrigularity of price changes etc.

Webserver is running on a unix system. It is also ok to run the program
on different system and ftp the final updated price file.

If you are interested in writing such custom program, let me know. How
mcuh time it will take and how much it will cost me.

Zaw