[Buying]  HMS CUSTOM GRIP

I'm interested in buying a HMS custom grip and would like to know if anyone has one for sale hopefully NIB but i'll take used depending on the condition hit me up if ur willing to sell thx
These are quite rare FYI. They cost around $50 normally.
still learning where everything is so bear with me
Also when it comes to price i dont really care cause i just want the grip if it helps