Optimized access to Blindsight, moreso than its other extrasensory options (tremorsense, scent, blindsense) has the most strategic impact on the varied array of game mechanics. Yet at this point in time, I don't see many value-oriented methods of access to Blindsight in any of the 3.5 sourcebooks.
So that's why I'm coming to you guys.
I'm looking for the most effective and value-conscious methods of granting an entire party access to Blindsight over a significant portion of an adventuring day.
This is assuming access to the money and game mechanics that a typical mid-to-high level party might have access to. And we're assuming that any referencing of the spell Blindsight, is using its most recent version in the Spell Compendium (pg. 32 - both normal & greater versions).
Yes, creating custom goggles of Blindsight via CWI is an option. But I'm curious to see if there are already similar (or better!) items currently located in other WotC sourcebooks that would bypass the CWI option.
Note: the A&EG has the Blindfold of True Darkness. But it is currently horribly underpriced and using 3.0 magic item creation pricing mechanics. Besides, it has some additional tweaks to how it works - making further nuanced changes to the blindfold somewhat more challenging.
Thanks for your help!