"What else do you want to buy?"

Translation: 你还想买什么？

[RolandHarris68]

When I am China, I hear 还 used like this every day in shops or restaurants...In its simplest form, people often just ask 还要吗 or 还要别的吗.

[jamtintraders]

Does 你也想买什么 work as well?

[Dr_Jerry]

I'm not sure. To me that looks like, "Do you also want to buy something?"