So, if you were eligible for the free amazon pantry delivery for purchasing something on prime day, you can get the 2.99 deducted from your total value as well as having 2.99 off for purchasing 4 eligible items.
You effectively get £5.98 off if you get 4 eligible items. Not sure if that is intentional but seems rather generous to give money off as opposed to just free delivery
A couple of the eligible items have discount vouchers you can use too
Only on one order so probably is prime day specific but still seems like a good deal to me