In reply to samben6:
For simple standard holds (flat edges, rails, incuts, pinches, etc. like you get on a system board), I would advise making your own from wood. It's really easy and they're nice. Plus the process of making them is fun. If you want to get fancy you either have to pay or get an angle grinder and a carving disc and be prepared to put some time and effort in to making them. You don't need loads though.
For feet, you can make them out of just about anything but little wooden chips are very easy.