Another nod for Hiromi. She is extremely knowledgeable about papers and carries a great selection. They have a (Kozo) "Mulberry Roll Thick" that comes in a 36 inch x 10 yard roll.
After 4 years of searching for a Japanese paper for inkjet I settled on this. The paper requires a lot of care in handling because it is so thin, delicate and prone to kinks. But it accepts a surprisingly high ink load (for an uncoated paper) due to its sizing formulation and holds a dot reasonably well. You won't get tack sharp prints with ultra high DMax of course, but its unique qualities are a perfect match for one portfolio of mine.
I've linearized it on an Epson LF with StudioPrint using the PiezoTone inks. Haven't tried to feed it through or profile it yet on an HP or Canon, but it should work with sufficient backing material.