When does this restock and is there a ping group?

it stocks one item, randomly. Time between restocks can be from a half-hour to two hours sometimes more, also random. Because it stocks only one item there's no purpose for a ping group. If you see something there you should buy it if you can.

Okay, thanks!

i suggest adding Blackheart hollow as a bookmark and just looking on there every now and again (but not too often otherwise you get banned from going there for a few hours!) Hope this helps! :)

Ooh, okay thanks! Didn't know you could get banned. :|

haha yeah but only for an hour or so!