Lewis Merc has Milorganite fertilizer, the best option for the straw bale gardening, it just came in yesterday. Better still, it is on sale for $6.99/bag! It will be on sale for another 2 weeks so now is the time to get it. I have purchased some to cover the garden giveaways and will have extra that members can buy from the club but not knowing how much we may need, if you can go buy your own that may be best. You can get 14 bales seasoned with a 36 pound bag.