I have been searching for the same things lately and I have found a few bearing companies in the US and Germany but none that have the 8mm x 11mm x 30mm bushings, I have found some that have 8mm x 11mm x 25mm in bronze, and 8mm x 11mm x 20mm and a company that makes custom bearings but I do not have any idea what they charge for the custom work.
http://www.symmco.com/metric.html
and 8mm x 15mm x 24mm aluminum, lined bearings from PBC
http://www.pbclinear.com/FJ-JIS-Closed-Linear-Bearing?tab=Specifications
and 8mm x 15mm x 24mm and 8mm x 16mm x 25mm from
http://www.igus.com/wpck/3542/DryLin_R_Lineargleitlager
The bushings don't have to be the same length if the part is slightly redesigned they just need the same diameter.
IGUS's prices aren't the cheapest , they cost more than bronze by quite a bit.
oh, and aliexpress as Callum Burns noted. They have quite a few available through vendors in China at really inexpensive prices, though I do not have a clue about their shipping charges.
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callum-burns 0
The only place other than Ultimaker to buy them ready made was aliexpress. Arrived perfect!
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