This project will start with a standard MF70 mill and finish with a 3 Axis CNC mill with an improved Y axis travel. The costs of this project should be kept below £150 including all the endmills and other disposables.
The cost of end mills is already quite high but they should last for some time. I use a company called Sorotec for my tooling. Its all 1/8th in. shank tooling which is fine but can be a little strange as a metric person.