I think I saw some. Depends on the colour green you mean too.
The other trick to AliExpress is to know what to search for…
There is bugger all when you search for “buffer tube” but heaps more if you search for “stock pipe”, “stock tube” etc.
Don’t bother searching for “green” and you need to look at each listing as they usually have a photo of a black one, with drop down option to pick other colours…
A good trick is to do a photo search of what you want, and then see what they actually call it. Then search for that.
Here is a place that has heaps of different colour handguard rails, look through their stuff and see what else they have. Usually if they have big colour range it carries across
Don’t be afraid to message them and ask too. “do you have a stock tube that matches this handguard colour” etc.
Oh and remember to scroll down to the “more to love” section that shows similar stuff from other suppliers