I also was/am a huge fan of B-ionic for 7 years or so. About 2 years ago, I switched to Fritz RPM because i was able to get it for ultra cheap and I was dosing over 300mL daily (spread out over 8 intervals). Fritz is weaker than B-ionic, but it was still a good savings.
When I moved here, I only kept frags and small colonies to reduce my load. But I still have about 8g left to burn through. At which point, I’ll probably switch back to B-ionic.