it can cost upto £1000 if u get it done from some software developer who would design a middleware code snippet to interact with the website database - extract the required information - and simply formulate in csv, xml or any other format you require..
BUT it wouldn't cost a penny if you are a bit techy...
if your merchant has database driven website then what you (or them) need is just extract the products table with some dynamic colums in there..
let me explain what is required and simply extracted from any database.
The Important Columns are:
1: id - unique code of the product to identify such as sku, internal code etc
2: Product Name - try to limit the words n don't forget to add the product keyword such as CPU or Processor in missing in the name field.. gud for
SEO
3: Description - don't include html tags coz affiliates have their own layout structures.
4: Price - without $ or £ signs
5: Quantity - number if preferable else Yes or No
6: Product URL - webpage address
7: Image URL - image address such as
www.xya.com/images/itsme.gif
8: Delivery Cost - if you can calculate dynamically based on weight normally
9: Category - your website category for affiliate to map with their system
Optional Columns
10: In Stock - Yes or No
11: Promotional message - such as special offer, new product, free delivery, 10% discount, pre order, rebate etc
12: Manufacturer - required for electronics
13: Type - new, used, refurbished etc
14: Expiry Date - if required
15: Weight - only numeric value with max two decimals ...
if you can design the feed with these attributes then it can be used on any price comparison engine, for affiliates, drop shipping websites and many more.. GET MORE OUT OF IT>>
let me know if you can add more stuff to it..
Ciao..