Welcome to planDisney, Jessica!
As you've found out,
Savi's Workshop is a really popular experience and so every Padawan in the galaxy is eager to make a booking as soon as reservations open. Guests are able to make reservations up to 60 days in advance of their trip. It's not uncommon for reservations to be fully booked up on the day they become available. "I have a bad feeling about this." I'm sorry that you've not been able to secure one of those coveted reservations, Jessica. All hope is not necessarily lost. If I were you, I'd keep checking in between now and your trip (especially a day or two before). Sometimes people's plans change and they cancel their reservations.
If you'd still like to get your hands on a lightsaber, then there are a couple of other options. If you stop by
Dok-Ondar's Den of Antiquities you'll find a collection of famous lightsabers for purchase. This immersive store also houses a variety of the galaxy's rarest treasures. If you venture outside of Star Wars: Galaxy's Edge, you could also make a trip to
Tatooine Traders. This store features a plethora of rare Star Wars memorabilia. You can even build your own lightsaber here (although it's not the same experience as Savi's Workshop).
I'm sorry I don't have more magical news for you, Jessica. However, I'm certain that you'll have a truly wonderful time at The Most Magical Place on Earth.
Mike