What screwdriver do I use? (OG Pebble w/4 screws on back)

I heard it was a Torx. Upon further research I discovered there are different types of Torx. The screws securing the back of the Pebble Classic down do in fact have the pin in the middle of each screw from what I can tell. Can someone point me in the direction of the cheapest possible online source to purchase the correct screwdriver to open up my Pebble?

I RMA-ed it and the replacement is on its way - but they're letting me keep my current one so I'm going to try to fix the screen tearing using the method I saw on YouTube with the shim adding pressure to help ensure a solid connection for the display cable. And if something goes wrong beyond fixing, then I'll just go to a facility to recycle it like Pebble Support told me to. It's the defective one anyway.

Model 301BL, the later version that actually can be opened without completely wrecking it.

I just have to tell myself that it won't be long before I have an Apple Watch Sport. I'm willing to sacrifice battery life for something that will actually work.