Where to buy linear rails & ball screws

[bluesking]

I've read bstmotion are a good supplier. Here is one of their linear rails:
https://www.aliexpress.com/store/pro...369798368.html

That comes to $230 + $160 shipping + VAT = around £360 for 4 carriages & 2 rails

Now, I also see big kits like this on eBay:
https://www.ebay.co.uk/itm/EU-20mm-S...2/163650557166

That comes to £320 + £32 shipping = around £350 for 12 carriages, 6 rails, 3 ball screws, and a bunch of Ballscrew bearings and mounts. It says stock in the EU so hopefully no VAT and a quicker lead-time.

Am I missing something? It seems I am essentially comparing Chinese components against other Chinese components. The price differences between these two are so huge it is hard to imagine what sort of quality differences could justify it.

The big kit doesn't quite have all the sizes I need, but for the price difference I could easily buy 2 different kits and make up the parts I need then put the leftovers on eBay!!

I'd love to hear about any relevant experiences.