Check out pics of the band & see if you can make out the make of their guitars. Then go to a guitar shop & ask to see the type. If those models are (likely) out of your price range, ask to see something more in your range but similar in style & look.
Even then know that just because you get a guitar like they do doesn't mean you're gonna sound like 'em when you plug into an amp! At this stage in their career, they have top amplification as well as instruments. A $700 guitar won't sound epic thru a $50 "First Act" amp. ; )