the BundesArchiv is located in Koblenz, Germany
Their contact information is here:
Address: Potsdamer Straße 1, 56075 Koblenz, Germany
Phone:+49 261 5050
direct Access for historical records research - general information is here:
http://www.bundesarchiv.de/index.html.en
Pricing for copy services of known , identified documents is here:
http://www.bundesarchiv.de/benutzung/kopierservice/index.html.en
note electronic scan ( and all , really) pricing is not THAt horrible, 3.85 euros for a single page scan delivered via email worldwide is not a horrible rate.
Research fees and services to locate documents of specific category that are not already known and identified has information available here:
http://www.bundesarchiv.de/benutzung/recherchedienste/index.html.en
research services can range from inexpensive individuals to very expensive and expansive group and staff research efforts.
( if you are looking for an in depth long term research effort requiring multiple inquiries, and multiple staff assistance times, yes, the cost could easily spiral above $1,000 USD here. The occurrence, however, is rather rare overall. )
This may be your best "start point" if you are interested in bundesArchiv documentation:
http://www.bundesarchiv.de/recherche/index.html.en
Note that WikiCommons is hosting over 1.1 million photographs released to public domain by the BundesArchiv since 2008.
http://www.bild.bundesarchiv.de/
http://commons.wikimedia.org/wiki/Commons:Bundesarchiv
Hope all that helps, and good luck
KRL, jonH