You don't want the best price. A poorly designed, cheap case will be a thorn in your side.
I would rephrase this as - what case company do you prefer for a good value product?
My own sources are Canadian which doesn't help you much. I'm sure others will chime in.
I highly recommend Olympic Case out of Florida. Their cases are very well built and I thought the prices were reasonable.
I've had good luck with Viking Cases. Check them out.
http://www.vikingcases.com/
Road Ready is pretty well respected also.
http://www.roadreadycases.com/
This may be a good start for you.
Pat