Unless its Facepunch official skin, don't buy any skin offered to you!
You can use them for free at:

Rust server: |EU|Free-Paradise PvP|Zombies|RustLeague|NoBP|

Rust client connect: client.connect 81.19.208.87:28015

Discord: https://discord.gg/XcCgEVH

Website: HUGE fan of: https://www.patreon.com/TiffyNyaa

and for Server owners: Skin ID in the steam web browser can be copied and added to your servers for free!
if you are admin of a modded server where a skin plugin has been installed ;)

Have fun!