Well, I think you can buy these in level 4 general stores (as an outsider), so no chance to buy them for a while. They'll cost 300 each (also as an outsider), so you better start saving until then.
Got plenty of Red and Grey but none of what matters... I prefer to keep searching though since it offers other items, cash and XP. If I ever run into more cash and I can afford it great but I'm not expecting it.