I was struggling with the same decision. If I'm guessing right, the other group will be at least $450. This group extended the deadline, so maybe we can make a better choice soon. I've also heard that another source might do a high-dose version too, but that might be more about quality than just the lowest price. Right now, I'm using ZYH from the J5 group buy, and it seems to be working great. I also switched to injecting once a week instead of every 6 days, and that might have helped break a plateau.