Great build surface for the price!
I like these double textured PEI sheets. While my preference for build surfaces changes from time to time, textured PEI is currently my "go to" surface, so these double sided sheets are like a two for one special. At less than $13, they're a steal!

For Bambu Lab P1P X1 Build Plate PEO X1Carbon H1H Double Side Pei Smooth PET PEY PED PEF H1H 257x257 Spring Steel Sheet For Bambulab X1C P1P P1S