there is lab reagent level purity at 25% or 50%. you can dilute it with pure water. that will save a lot for the shipping. Glutaraldehyde shall be available at chemical stores.
You know what type of fumes and toxicity that implies?
It's like handling concentrated acid, then you have to dilute it. Spill any, get any on you, in your eyes etc, that's not something I'd suggest for hobbyists to play with.
This is a much more serious safety issue
, for what?
Save a few bucks........?
The transferring of concentrated chemicals and dilutions is where folks make careless mistakes and get themselves hurt.
Even at 1-2.5 %, it will cause permanent eye damage. Fumes are bad etc.
Stick with the lower concentration.
Do not play with highly concentrated biocides, few hobbyists will do common sense safety protocols for handling such toxins, and then you have the issue of the correct dilutions.
The risks are not worth the savings.
A few $ not to handle it is well worth it.