I have gone to there shop on Varick St (Brooklyn). Its easy to get there via public trans. Dont know how much of a better deal you'll get but Im sure it would beat shipping. I know that they like for you to call in advance if you do plan to go.
There was a place, North East Marine Specailties, in Syracuse NY that had free ground shipping and great prices on B-Ionic. But I just tried their web site and it doesn't seem to work. www.nemarinespecialties.com Anyone know if they are still around?
I was in ESVs neighborhood working with a client when I stoped by.I noticed that a local store sold the two part 32oz. cheaper. I told them and they gave it to me at the better price. I would still call them before I go and see if they work with you on the price.
One of the online vendors sells it for 24.99 for the 64 oz concentrate containers - think it was marine depot but I could be wrong - I bought it about 3 months ago - so much for the short term memory recall.