Coco coir chip is nothing new it's been around in the horticulture's world (especially among orchid people) for a long time what is new is that now it is marketed to snake keepers.
I have tried both Reptichip and grow it side by side with the same results.
I now use grow it exclusively and buy it from here http://www.midlandhardware.com/181071.html, it is on sale on a regular basis for les than $10 and I usually order 10 at the time.
Other consideration if you need a lot of it (small pallet) is this http://www.prococo.com/