PCB Fabs - TeensyUser/doc GitHub Wiki
Comparison Services
PCB Shopper (https://pcbshopper.com/ ) will take your board specifications and give you cost estimates for a large number of Fab houses including shipping costs and time estimates.
China
ALLPCB (https://www.allpcb.com/ )
Every month one order for free (incl shipping) up to 4 layers ≤0.015㎡
Assembly services
JLCPCB (https://jlcpcb.com/ )
like Seeed, 2$ / 5 pcs
Hong Kong based. DHL shipping to USA is fast and relative inexpensive.
Also, has inexpensive assembly services.
PCBWAY (www.pcbway.com )
Seeed (https://www.seeedstudio.com/ )
Mostly did 2 layer, DRC 6/6 mil boards without issues so far
Uncomplicated upload from Eagle (just drop the gerber zip which is auto generated from Eagle).
Small boards start at about USD 5 for 10pcs.
Most board colors without additional price
Manufacturing time about 1 week, shipment to Germany usually 2 Weeks (cheapest option)
USA
EUROPE
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