Large product description re-write job

The product descriptions that I am using for my eCommerce site are not unique and i would like them re-written to make them unique in the eyes of the search engines. This also applies to the titles of the products which would also need re-writing.

There are around 3600 different products and the current descriptions are around 2 - 3 sentences long which is satisfactory.

I would like to obtain some quotes for this work to be carried out and a rough time frame would be grate.