Ok this will appeal to a select few, but it's a handy way to save money at Amazon if it's something that is never discounted.
The Prime members discount requires you to be a paying Prime member, not on the free trial.
In a nutshell:
1) Set up registry, add item/s
2) Pay off registry earlier than 30 days before your selected wedding date
3) After your wedding date, you will receive an email with the voucher code. You will have 90 days to use it. It must be used on items sold and delivered by Amazon.
What's the catch here? Is there anything stopping me from creating a $1 wedding registry then using the discount on junk I want?