Hi.
I have found some nice 3 pieces of HIWIN rails HGR20H about 3 meters long each and 2 blocks marked HGH20CAC.
I am trying to find myself more blocks for that, on ebay Ive seen the HGH20CA at about $45 each.
Here are some links that sell the HGH20CAC, those rails and blocks came off some large format printers that were dismantled. There appears to be quite a few suppliers for that particular block as printer part.
I am asking your opinion and experience in dealing with Chinese providers, the price goes from $27.5
Aliexpress.com : Buy engraving machine sliding block, the import of silver, HIWIN slide block, HGH20CAC, HGH25,EGH15, HGH15 from Reliable machine for making cookies suppliers on Hongda Laser and CNC machinery equipment co., LTD | Alibaba Group
HGH20CAC,HGH20CAZAC,HGH20CA,HGH20 HIWIN Linear Bearing, View hiwin linear bearing, HIWIN ABBA PMI THK IKO Product Details from Tianjin Tengqi International Trade Co., Ltd. on Alibaba.com
http://item.taobao.com/item.htm?id=36772786221
Agent HIWIN linear slide bearing guide HGH20CAC HGH25CAC HGH30CAC
http://detail.1688.com/offer/39290292321.html?spm=a261b.2187593.1998088710.84

I have little idea how to buy from Chinese webs.