[This is a composite of ideas from Shadweaver, Dataweaver, and tbone]

Extra Arms (revised)                               Variable Cost
   Extra arms can give a maximum grappling bonus of +4.  The price is
summarized on the following chart:

Number
of Arms   Price
   0      -30
   1      -15
   2        0
   3       10
   4       20
   5       25
   6       30
   7+      35