Should I NoIndex NoFollow my BUYNOW page?

[BeytzNet]

Hi,

As stated in the title, I am wondering if I should NOINDEX NOFOLLOW my shopping cart page - it is actually a buy now page that receives in the URL the Item ID - only one item per purchase.

I received duplication errors so now I added canonical and I wonder if I should simply remove it altogether.

Thanks

[irvingw]

canonical them to their page without the parameters and handle the parameter IDs in Google WMT under "URL parameter Handling"