The company I work for is well known for our spey rods and we sell blanks.

12'5 foot 7 wt to 15 foot ll weight we make a complete line blanks are 425 if i remember right...

also most manufacturers sell blanks through their dealers try the Anglers workshop in Woodland Washington or The Madison River Fishing Company of Ennis Montana you should be able to find sage, scott, loomis and Winston in blanks...