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The following sites are a good resource for research and history of the 2nd SS "Das Reich"

Feldgrau
Axis History Factbook
Propaganda History
World War II in Color
Panzer Museum
2nd SS "Das Reich" Wikipedia
Lexikon der Wehrmacht Great German site for all kinds of information: Soldbuch, Landser slang, etc. Unfortunately, no English translation.
Wehrmacht Awards
SS Helmet History

The following sites are recommended for items to complete your impression. As always, be sure to check with a unit commander before purchasing!

Wephaus
Lost Batallions

Landser

At The Front

1944 Militaria

Soldat FHQ
Ostfront
Pocket Trash
SM Wholesale
Stewarts Military Antiques

Wine Labels (for purchase)
Labels
Postkarten
Misc. Documents

Links to other re-enacting organizations:




1st SS Panzerdivision "Das Reich"  (Southeastern Living History Group)
1st SS Panzerdivision "Leibstandarte"
Reenactor.net