The vouchers are sent to me via mail when I order through Disney.
I just re read the site and found I was wrong on some info. If you buy a 1 day ticket at the gate, you pay gate price. The rest are discounted.
"When you order Florida Resident tickets, you will receive an exchange certificate in the mail. Redeem the exchange certificate at any Walt Disney World® Theme Park ticket window by presenting the exchange certificate and valid photo ID.
Tickets are non-transferable, are only valid during regularly scheduled operating hours and exclude activities/events priced separately. No additional discounts apply. Proof of Florida residency for each adult required.
*1-Day tickets purchased at the gate will NOT include Pre-arrival savings and will be sold at the gate price. "
I always ordered ahead of time and gotten the vouchers (green credit card looking things). BTW, if you order a 1 day ticket ahead of time, it is discounted. Its like $65.