Yes, that is a popular request and that is something I'd like to implement myself. The issue there is that Amazon only makes the price per unit info available only to logged in users. Trying to onboard this functionality will undermine one of so.cool's key features -- anonymity and tracking protection. Thank you for writing!
Would it be possible to grab count from the title using regex or something similar? It won't be precise, but most sellers will use a fairly predictable format for displaying count and sometimes even size.
A regex may work, but only for batch-type runs, no for live queries. For example, when I compile a list like this: https://www.reddit.com/r/Frugal/comments/7utksx/sortable_list_of_current_amazon_coupons_google/, I effectively do what you are suggesting.