Is it safe to purchase batteries for the spark from Aliexpress?
Has someone ordered from them?

https://bit.ly/2L9lpmZ

Hello, thank you for reaching out to DJI Forum! We highly recommend to buy the battery at our official store. Please click the link to purchase the battery: Spark Battery

Thank you.

But do you ship to israel?

thats a tricky one.  there appears to be a few physical retail store in your country, they may be able to offer some services if you are too far away form one of them and contact them directly..

https://www.dji.com/where-to-buy   and  enter proper information..

Hope u can find more batteries!

looking for the reviews, ....! But the price is only good, if you order not just one or two, isn't it?