I know that mamoths lived in Alaska. Do there exist sources of mammoth ivory?
I found some mammoth ivory stores in US - elephantivorytusks.com, boonetrading.com.
And you can legally buy real elephant ivory. I cannot.
About Russian prices. Tusk pieces costs about 100-200 USD per kilogram (depends from condition). Bog ivory twice as much, ivory scrap cheaper (also, depends form size).
Do you remember my topic about scrap?
http://www.penturners.org/forum/showthread.php?t=84212
That costs me about 60 USD (1,5 kilos, average condition).
That heap about 130 USD (3 kilos, good condition).