Basically you pay $50 for 28 club regrips (service only). I'm sure the thought process is 14 clubs per person, so grip changes for 2 years (which is how long the card is good for). There are some other things included with the card, feel free to read about it in the link. The price of the card goes down to $30 if you buy a club at the same time you get the card. So I went over to the used club bin to see what the cheapest one I could find was. I thought the worst case scenario is I find a $20 used club and can use it to hit rock or something , but I was lucky enough to find one for $5 (there were lots of clubs for $10, looked like mostly 6 irons). So my total ended up being $35ish with tax for 28 regrips = $1.25 per (plus the cost of the previously purchased grips of course). Since I was there with my dad, we got to use most of the card for both of our clubs.
Cheap grips from another post