06-26-2015, 03:04 AM
As far as I know the cheapest place for fertilizer is BEI in Hilo. I'm pretty sure all the other places buy there and resell. The minimum purchase is 50 pounds, however that bag may cost you less than the 20 pound bag at Home Depot.
If you've never been there its not like a regular store with a showroom. It's a warehouse you're not allowed into and you go into the office to buy and they bring it out to you (like a feed store). The people there are very knowledgeable and if you're not sure what to get they will tell you what everybody else has had luck with. I recommend opening an account with them (free) so that when you go back there you can ask what you bought last time.
ETA: http://www.beihawaii.com/
If you've never been there its not like a regular store with a showroom. It's a warehouse you're not allowed into and you go into the office to buy and they bring it out to you (like a feed store). The people there are very knowledgeable and if you're not sure what to get they will tell you what everybody else has had luck with. I recommend opening an account with them (free) so that when you go back there you can ask what you bought last time.
ETA: http://www.beihawaii.com/