Campagnola makes great tools that you can buy individually instead of the complete boxed set. VAR, a French Co, also makes very good tools. I would suspect they are more common in Europe than in the USA. I've had many of their hand and frame tools for years and they've outlasted some of the older-type Park tools. The Japanese also make some quality tools. Hozan is a name that comes to mind.
Keep looking. You'll find what you need. Just don't restrict yourself to a particular brand.