Almost a complete ban on interstate trade, can only be sold with in the state you live in as of 7/6/16
It's not as bad as you think- check out this part of the African Ivory interstate sale rules in the link you provided:
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To qualify for the de minimis exception, manufactured or handcrafted items must meet (i) or (ii) and (iii) - (vii) of the following criteria:
(i) If the item is located within the United States, the ivory was imported into the United States prior to January 18, 1990, or was imported into the United States under a Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) pre-Convention certificate with no limitation on its commercial use;
(ii) If the item is located outside the United States, the ivory was removed from the wild prior to February 26, 1976;
(iii) The ivory is a fixed or integral component or components of a larger manufactured or handcrafted item and is not in its current form the primary source of the value of the item, that is, the ivory does not account for more than 50 % of the value of the item;
(iv) The ivory is not raw;
(v) The manufactured or handcrafted item is not made wholly or primarily of ivory, that is, the ivory component or components do not account for more than 50 % of the item by volume;
(vi) The total weight of the ivory component or components is less than 200 grams; and
(vii) The item was manufactured or handcrafted before July 6, 2016.
For items made of African elephant ivory that qualify as an ESA antique or meet the de minimis criteria, you do not need a permit from the Service to sell ivory across state lines. However, if you are offering African elephant ivory for sale, you should be prepared to provide appropriate documentation to the Service, if asked. We would also suggest that you pass along all documentation to the buyer of your elephant ivory items. For detailed information on documentation requirements, please refer to Directors Order 210.
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So as far as I can tell the above rules basically only exclude for sale very recently made knives or knives with HUGE ivory slabs.