FRESHNZ90
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As opposed to the normal referral, where, at the moment, you save $59.99 on your first delivery, this promo code saves you $90 in total, over the next 4 deliveries ($40 + $30 +$10 + $10). Probably ideal for those who would like to have at least 4 deliveries (rather than try 1 and see if they like it).
Found the deal in my inbox. It doesn't indicate an end date so I don't know when it expires.
Code is: FRESHNZ90