Thanks samala. I have already searched Ebay using the terms "macroalgae" and "macro algae." However, I am more willing to trust someone's personal experience with an ebay vendor than the vendor's feedback rating. As you might also know, a lot of those links in that thread are dead. Additionally, many of those sites do not have the most intuitive interfaces. I have tried contacting one of those sites already and I still have not gotten a response. Finally, maybe I wanted to buy some macro from a fellow hobbyist, rather than an online vendor.