What ive found w/ the pricing of Dats, or actually any fish other than arowanas, is that it all depends on where you buy the fish. for example large ST's can go for as little as 100 USD to as much as 1500 USD. i think alot has to do with markings on dats and the availablity at the time. one secret i found is that the higher price large dats sold in LFS's usually come from distirubtors. the cheap ones come from customer returns.
indos are the same way but usually dont go any higher than 200 dollars for a 14 inch specimen...that ive seen anyway.