I have used Caspase-9 Antibody (Human Specific) #9502 you can obtain from CST. 

Thanks, Go. Does it give you a good signal?

Cleaved caspase-9 p10 Antibody (h331): sc-22182 (Santa Cruz)

Cell Signalling Technologies make a good cleaved caspase 3 antibody, they also offer a selection box of smaller amounts of cleaved and total caspase antibodies which is really good as well.

one more vote for CS#9502!

I have never yet gone wrong with Abs from Cell Signalling Technologies

Cell Signaling Technology CS#9502

We have used casp9 cleaved Asp315 # 9505 and Asp330 # 9501 from CST .

You can refer to the link below:-

http://www.cellsignal.com/products/primary-antibodies/cleaved-caspase-9-asp315-antibody-human-specific/9505