Hmm... some ideas for you via Amazon (it really is the way to go for most items):
Map of Civil War Battlefields: https://www.amazon.com/Historical-Documents-HOLD1098638975-Civil-Battlefield/dp/B001IKB3Q6/ref=as_li_ss_tl?ie=UTF8&qid=1494183309&sr=8-2&keywords=civil+war+gift&linkCode=ll1&tag=firstvictory-20&linkId=6c78ba63e71cb454385883290dd447cd
Hang up picture for an office or home:
Civil war coin:
Hope this gives you some ideas. These are affiliate links, don't be alarmed. If anything at least it takes you to Amazon and you can browse around related items.