Hello blackjack
According to what is available on eBay's site, you must have a service that is One Day only to qualify for Get It Fast, so services that offer a range of days would not qualify. So, if you select a service that is One Day only, your listing will post with the Get It Fast option.
UPS Next Day Air and Next Day Air Saver
Fed Ex Priority Overnight and Standard Overnight
and a generic One Day Shipping option are services that have one day only as their shipping.
- Craig