The continuation of Crisis in the snows, Eylau, that has been reprinted seems to be available.

Napoleon’s Triumph: La Grande Armée versus the Tsar’s Army. The Friedland Campaign 1807
By James R. Arnold & Ralph R. Reinertsen

http://www.napoleonbooks.com/index.html

But no discount for buying both?

Still is a bargain compared with

http://www.amazon.com/gp/offer-listing/0967098513/ref=dp_olp_used/182-9644910-9309737?ie=UTF8&condition=used