Following on from the SCA $1 drill bits, here are some that are almost as cheap at Bunnings. They are imperial, not metric, but for a most purposes the difference is minor (eg at the smaller end a 5/64 drill bit = 1.984mm which is 0.016mm from a 2mm metric bit).
Drill bit sizes go from 1/16 inch (~1.59mm) to 1/4 inch (6.35mm).
Thanks. I got screwed with the SCA drill bits. Made the order on Wednesday night and they refunded me today saying there wasn't enough stock :(