How much does a Black Box Underwater Locator Beacon (ULB) cost? I'm curious if anybody can provide a rough price estimate for a commercial aviation ULB like those used on Black Boxes. 

Area of interest: Europe i.e. Euros, EASA CS-25.

(For instance the RJI ULB-362 or the Dukane DK-120, but any equivalent is good)
There is one listed here on Ebay for $750. Some of the makers like L-3 list contact info for getting pricing, all of the other sales sites I am finding look like you need to submit for a price quote.