I would consider the Diamondglass rod by Diamondback 1st. Blank $147.
Then Steffens. Blank $120
Lamiglas blanks, may have been discontinued?
There are others, but these are the ones that will sell you a blank.
"I can't set foot in the same river twice, for when I do
neither the river, nor I will be the same." Heraclites