Hydrophones: Cetacean Research C54XRS/SQ-26 and DPA 8011?

["Rory" rory_ca2]

I'll be using a Sound Devices 702T to record Humpback and Fin whales
from late June through August.

Can anyone speak to the relative merits of the Cetacean Research
hydrophones C54XRS SQ-26 and the DPA hydrophone 8011?

The DPA, at $2600, is expensive. Does anyone know of a company that
rents it?

Finally, I've seen a number of references, quite old, to hydrophones
made by Bevery Ford in Vancouver. I found an email address, but it no
longer works. Does anyone know whether she still makes hydrophones
and, if not, whether her hydrophones surface second-hand? Are they of
comparable quality to the Cetacean Research and DPA models for this
application?

Thanks.