Was actually looking to see if I could find any student freebies for Amazon pantry?
Couldn't find anything specifically for students this month (have had this and porridge and washing powder before?) but seeing as it seems available still, free if you're placing an order anyway?
It doesn't say anything on the product page about it, I found the following on a washing tabs product page (_;)
'Amazon Prime members spend £20 on Pantry products and get a free Coca-Cola Zero Sugar 1.25L. Add Coca-Cola Zero Sugar 1.25L to your basket and the discount will be applied at checkout. Offer expires 30 April 2017'
Seemed to work for me on the order I've just done, hope it helps?
Have now found the offer on just about every page I've looked at on Amazon pantry, d'oh :)
It's mentioned under offers and promotions about two thirds down the page.