Well, first of all, which caspases do you want to check and in which cell system?

In our lab we used antibodies for caspase3/cleaved caspase3 and caspase8 from cell signal and the bands are very good.

Cell signal, 9661S for Cleaved Caspase 3 in our lab.

I use caspase-3 and 9 cell signalling ...

caspase 3 9662 (for detect pro-caspase 3 e caspase 3 mature)

caspase 9 9504.

I need caspase3, caspase8