First of all, congrats on getting the camera, and for deciding to actually use it.
Next, I have an unopened box of Efke 25 12x20 (25 sheets) that I got for my pinhole camera, but do not see myself using any time soon, as I prefer to use this weird old Ilford roll paper in the camera now. The Efke film is expired by a few years, but has always been kept in a 40 - 50 F fridge. The box has some water damage from a condensation drip, but nothing serious that would affect the film, as it is not deep damage, and the film is wrapped in plastic. PM me if you are interested. I am in L.A., CA. A box sells at Freestyle for $188 new. Make an offer.