Just bought my vouchers over the phone to use next week. I can confirm what a PP said regarding prices for 5 day tickets. Adult 5 day 1 park/day tickets are $283.92 and Child tickets are $267.22. 5 day park hoppers are $325.77 and $309.28. I originally purchased 5 day 1 park/day tickets for me and my 3 year old. I just prefer DL over DCA and there is more that my 3 year old can do. About 30 min after purchasing, I decided to try to upgrade to 5 day hoppers, given the significant savings and my AP sister joining us for a few days. I emailed the agent I worked with and asked if it was possible to upgrade, he called back about 30 min later, booked my hoppers, and then cancelled my original booking. Checked my credit card statement and refund was already pending.
I think someone asked earlier in the thread if the vouchers could be taken to one of the resort hotels and exchanged for tickets at the hotel desk. Voucher specifically states that DLR hotel guests can exchange the voucher at the desk upon check-in.
The guy I worked with was great. He kept me on the line and wanted to be sure I received my voucher email and a separate receipt email before hanging up. I have his contact info if anyone is interested.