I have absolutely no qualms about buying Chinese stuff, but like Lenny said, shipping costs could make it about even.
I don't know if you'd be subject to import tax and shipping handling charges from your end and there is also the massive peace of mind of buying from somewhere more local so you at least 'feel' you have a comeback route if all is not well.
When I researched and bought my collets and chuck, I found that 'not all' ER32 collets were 'standard'. I think the difference was in the retaining ring in the chuck nut rather than the shape of the collets. Of course, if you buy the collets and the chuck from the same place then that wouldn't be an issue. Mine both come from India