The USDA is offering kazakhstans apples which are very good for wild apples I’m told. Some members have been growing them a number of years now. Here’s a link about the wild apples http://www.bbc.com/future/story/20160523-kazakhstans-treasure-trove-of-wildly-flavoured-apples
These were the ones I requested from the USDA this year
PI 613953 KAZ 96 03-07 Malus sieversii 2 Scion GEN Remove Note
PI 613954 KAZ 96 03-11 Malus sieversii 2 Scion GEN Remove Note
PI 613957 KAZ 96 03-14 Malus sieversii 2 Scion GEN Remove Note
PI 613958 KAZ 96 07-07 Malus sieversii 2 Scion GEN Remove Note
PI 613999 KAZ 96 08-17 Malus sieversii 2 Scion GEN Remove Note
PI 614000 KAZ 96 09-02 Malus sieversii 2 Scion GEN Remove Note
Here is the growingfruit thread Kazakhstan Apples