please add "never deliver" feature to blacklist certain food items

[nmz787]

for example, I never want to receive potatoes or onions, because the prices at my local grocer is MUCH less expensive.

If this cannot be added to the website, please release an API that people like myself could script with (i.e. run a CRON job every week to login and search the delivery list with a regexp, and then remove items that match).