3 axis machines are nice for very simple prototype parts but as soon as you need to mill objects from multiple sides with multiple tools this can quickly become a a pretty manual process. A 4/5 axis machine could solve that problem though these are drastically more expensive. If this machine could not only be used for prototyping but also for production at a certain extend it could quickly pay for itself though.
Things to look out for:
Full package: € 1061
Open Hardware/Free Software
a compact sturdy 3 axis mill developed by KarlG in the fpv-community.de forum. very precise. To order over pm from KarlG but the list seems to be long...
basic kit 1500€ (no motors, electronic and software)
assembling and calibration 500€
forum link (all german)
5 axis cnc milling and 5 axis 3d printing
From £5000 (approx. $6300)
Ship from Canada
They seem to have pissed off at least one customer in a major way: http://www.novakoncnc.com
mills ranging from consumer to pro range with accessory for 4th axis
Optional 4th axis
apertus° decided to get this one in the end.
around 15 - 20 k$ for full package with tool changer and 4th axis.
They also have an injection molding accessory for 800$: http://www.tormach.com/store/index.php?app=ecom&ns=prodshow&ref=32079
Interesting analysis of their design decisions : http://www.tormach.com/uploads/11/TD30204_DesignAnalysis-pdf.html
4 axis option probably from China
4 & 5 axis
5 axis desktop CNC mill - still awaiting crowd funding campaign launch, no product until 2015
3500 $ target price
5 axis CNCs
different configurations for soft and harder materials - no pricing information on website