Purchasing 12.5% bleach

Just Curious. Where do you guys buy your 12.5%. Not the Clorox (6%).
Do you buy it from:
Pressure Washing Supply?
Pool Supply?
Chemical Supply?
Elsewhere?

What brand is it (for example: sunny sol?)

Depending on what state your in…it can somewhat hard to find.

I hear it is easy to find in florida but not so much in the south east.