Hello,
I remember I worked on exactly the same type of project but about two years ago. The thing is that I am not sure that now Amazon will keep the data into the cart after new login, that we'll have to check once work begins on the project. They might've changed to saving the data into a cookie or a session and once you log out the data gets erased from the cart. In that case there are other options that could yield same results.
We'd have to discuss more on the matter.
Contact me if you are interested in high quality works, communication and reliability... I've studied in US 7 years, I am great with research and understanding my client's needs. I go over requirements to obtain the best results time after time.
More about me... I have over 10 years experience in advanced data extraction, analysis and mining, including server administration [Linux, Solaris, FreeBSD], database creation, Excel works, web development [ PHP, Perl, Python etc ] I have studied 3 years towards my Mechanical & Aerospace Engineering degree at the University of Texas at Arlington and will be continuing starting next year when my immigration paperwork will get through.
I am eager to take your project and provided with clear and thorough specifications, I will certainly deliver the best results possible.
Thank you for your consideration,
Radu C