With this card I paid 1950 baht including caddy at Laguna on Monday, Loch Palm 2500 baht last week. You can also play at Loch Palm for 1300-ish baht on Thursdays if you also apply for an additional card which is free. (May be more now as they raised their prices 1st Nov)
PCC 9 holes course dont give any discounts anymore unless you play 18 holes.
So the card saves you money for sure! They also arrange tournaments etc.
The renewal fee is 3000 baht/3 years, for new members I guess there is an additional 3000 baht when first joining the club.
http://www.expatgolf.com