I just got some Osmocote flower and vegtable 14-14-14 it was a 1.25 # bottle for 7.99, 500 00 gel caps on ebay for 9.99 now I have 5 years of root tabs. Miracle Grow Shake and Feed is made by the same company Scotts it's 10-10-10 and a slow release fertilizer that lasts up to 3 months Osmocote claims 4 months. The Osmocote is a polymer coated slow release fertilizer that releases slowly and takes a week to swell and release ferts, the Shake & Feed my be the same thing but they didn't have a Data Sheet at Scotts for that product, so unless you find someone that claims to have used it with good results, I would wait to find the Osmocote. Get on the phone and try the local hardware, home depot, and lowes, btw I got the smallest bottle and have a third of a bottle left after filling 500 00 gel caps. Also some people get the soil and make mud sicles to use in their tanks, good luck.
It may be harder to find in Hi or did you mean high??? that makes it even harder. No need to fear we won't come to Hi and start asking around for Milesm and if we do someone is bound to call the cops.