Drillpro MGN12 100-1000mm Linear Rail Guide with MGN12H Linear Sliding Guide Block CNC Parts – 1000мм.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t think there is an active coupon right now – at least in my database. I don’t know if this is a good price – number of records in my database is too low!
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG589b2e, BGd2f208, BGHTT15, BG20236Tool, BGf73ddc, BG28c7b7
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. China – Drillpro MGN12 600mm Linear Rail Guide with MGN12H ($-3)
2. China – Drillpro MGN12 500mm Linear Rail Guide with MGN12H ($23.99)
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $29.99).
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).