I would like to find out the value of antique ivory ekipas (around
150-200 years old) from Namibia and if and where they may be purchased
in the United States.

Anyone else - like me - who doesn't know what ekipas are can find out here.  
Interestingly, this site by the Namibian Chamber of Commerce and
Industry suggests that they first appeared at the end of the 19th
century.  That would question claims that some are 150 to 200 years
old, but often native artifacts seem to grow in age the further they
are removed from their place of origin.

http://goss.rho.net/ncci/htm/ncci_logos.htm

myoarin - I still think it is legal to purchase ivory ekipas in the
U.S., as long as they are made of pre-CITES convention ivory.  But I
still can't figure out a value to antique ones.  Although it wasn't
the exact answer I was looking for, you gave me some very valuable
information.  I'd like to transfer $25 to you just as a bonus.  Are
you able to send me a PayPal invoice, since I don't think I can
transfer the money through Google?

Mark,
I am pleased that you found my comment useful.  Thank you for your
offer, but comments are free, and I enjoyed learning about a new
subject, especially since Jadayu found a site that describe ekipas so
well.
Take care, Myoarin