Since you only need 2 of them, I would just go to a pro shop and buy them. Michael does have great prices on the grips, (less than $1 a piece)but he usually charges about $6 or so for UPS ground shipping so unless you are buying multiple grips, I would just buy them locally. I buy grips and slugs from him 2 times a year and he is a great seller and a really nice guy.
jkiser01