I believe MadVapes "Custom China E-Liquid" is U.S. mixed from Dekang Components - $14.60 for 60 ml @ 24 mg/ml.
MadVapes offers only a few Tobacco/Menthol flavors in this, but you can specify the strenght of nicotine.
The Top Vapor line offers additional flavors.
"China E-Liquids" are Dekang made in China - $10.99 for 50 ml @ 24 mg/ml.
It seems MadVapes doesn't offer other than 24 mg/ml. on the "China E-Liquids."
A sample bottle I received in an order from MV was labled both "Top Vapor" and "Dekang."
I've since obtained two 50 ml bottles of DK-TAB.