[suzeeq]

Yes, buying all the fixed needles in each length and size can get very expensive. But if you don't use a large number of sizes, the 24 and 32" lengths in the sizes you use most probably won't cost a lot even getting individual needles. I won't buy an interchangeable set because I have no use for needles under size 8 (9 really, but sometimes I use 8s) so half the set would be a waste of money for me.