United Record Pressing - Pressing nothing but vinyl records for over 60 years.

United Record Pressing, your one stop record making shop since 1949.
Hi, so I'm going to be releasing a couple 7"s in the next couple months and wanted to offer digital downloads with them. As if they were reading my mind, United Recording Press recently announced a vinyl+MP3option package.

United Record Pressing URPressing - vinyl record lacquer mastering, vinyl pressing it is on their home page.

Now before I jump on this, I was wondering if anyone knew any other ways of doing this in a realistic and convenient way? Two main criteria are:
1) Individual download coupons with unique codes
2) Secure hosting of music files and EASY access for the customer. I don't want to have to deal with a bunch of "my download coupon isn't working" emails.

Anyone with experience in this who is willing to share their advice/experience, I would be very grateful.