There may have some in Prince street Market but not sure. Most people are oredering them online. But if you need some I have some. I think I paid $3 or $4 for it. I have 2 bags left.
I have been using Mrs. wadges since I started my tank. It's the same crap as you would buy in a pet store, only cheaper. Order direct from the Mrs. Wadges website. I order 5 containers every 4 months.
Thanks Kasei I was going to order it online but if I could find some locally I would grab that. I have some *gasp* Kent Kalk that I can use until it arrives.
Gotcha - I am still using the same DIY method for my ALK and Calcium - just picked up 2-50lb bags of 100% calcium chloride - freaking awesome since it only takes 2 cups to make a gallon
And, as you can see from my corals, no issues (yet)
Brooklyn zoo (?) on 9th street in park slope had some kind of kalk powder for $1 a box. I forget the brand.
I have a bag of Hoffman's Hydrated Lyme (from a gardening store) It works the same. I posted all the info on RDO and everyone said it would be okay. Same thing, just not food grade. And it was $3.59 for a 5 poind bag.