Signature shops are places where users can commission shop hosts to make them signatures.

• One shop per user.
  
• Signatures you sell to other users may not be submitted for grading. The maximum that a user may pay for a single signature is $4,000,000(*).
  

(*) exception (source: SHL Rulebook, section K "Transferring Money"):

Quote:(...)
a. The Maximum any SHL Teammate can pay to another Teammate is $1,000,000
                          i. The Maximum a teammate can receive from their teammates in a season is $2,000,000.
                          For Example
                                Player A pays $1,000,000 player B for sig
                                Player C pays $1,000,000 player B for sig
                                Player B cannot receive any more money from teammates that season
(...)