I can't seem to find a black candle anywhere

[shadoweave]

One of my favorite stores is the Magic Cat http://www.themagickalcat.com/Default.asp
Another place with an enormous amount of supplies and finished products is Etsy, there you can find homemade and vintage products as well.

[Lord_of_Nightmares]

Are you sure the corner store is only Catholic? Can't think of any use for anything but white candles in catholic church. Is it possible the store is a botanica in which they make use of saints and stuff. In that case, black candles would be part of the standard stock, and supplies for Santeria and Houdon could be found there. They are religions that have many magical practices. In my town there is a botanica in the same block as the Cathedral, and it does mixed business.

There is folk Catholicism and Santa Muerte candles come in ALL colors. She is only an example. The church hates her.