(Source: I am the eng lead of Google Registry, which run's Google's TLDs.)
Gandi seems to do this as well. I recently tried to buy one through them and they quoted $600, and required a corporate subscription. 101domains had the same one for a little over $100, which implied to me that there's a paper process with people somewhere and each registrar is pricing accordingly (since all .ai are $100/2yr flat).
Good timing on your comment, too, since buying-then-transferring seemed like a good strategy until I read it. Didn't realize .ai was so fundamentally manual. Although[0]:
> We expect that about mid 2017 we will support EPP and other registrars.
Also, we (Charleston Road Registry) are definitely not a small company, but we run ~45 TLDs with a team of engineers much smaller than 45, so we have a ratio of TLDs to engineers significantly higher than 1:1.
//Edited the fee.
That is an interesting avenue to go however, so thanks!