There is a thread on this board from Siki on Nov 28, 2007 that has this info.
Titled: Aruba Surf Club Prices
Prices have edged up since then (11/15/07) maybe $100-$1000 generally.
2 BR Platinum OS went up $100 and OV went up like $1100.
The gap between OV and OS has closed to $1100, which I thought was little odd.
*Supposedly* they expect to sell out of Platinum OS and OV by the end of the season. So they say in the sales pitch. Your mileage may vary.