Do an internet search for rod building supplies. This will provide you with web pages of many, many rod building supply companies. Then look at their "house brand" blanks (the ones with their name on them) to find the best buys. Look at IM6 blanks for the best value and lowest price. And use a section of 1 5/8 inch PVC for a very strong and durable rod case instead of the aluminum ones to save a few more dollars.
Doing the above will allow you to find what you are looking for.