Camera lens

[italiasian2k5]

Hi, it seems to me the best deal i can find for the "Sigma 10-20mm Sony/Minolta mount" is on Abe's of Maine. I tried using bing for more cashback but can't seem to find the item itself on the search but i can find the store for 2.5-17.5%.

So my questions are... how do i tell what percentage i am saving? Or even, how do i tell if it is taking effect? Also, can i use the "LOYALTY10" code on top of bing cashback?

Thanks! and sorry if this is the wrong section, i have no clue where to post!