This is what I use... usually get it at the local ACE (because its a locally owned hardware store that doesn't suck... and people actually know hardware)
http://www.acehardwaresuperstore.com/1161-plant-food-small-pkg/26522.html
now ... on the idea that 0-10-10 by it self does something magical... that of course is nonsense.... but I do drastically reduce the amount of N I bother giving the trees usually sometime after Halloween or there abouts ....
still leave the tea bags full of fert (5-5-5) on and slow down to only feeding with liquid every other week ... a single gallon jug has lasted me 2yrs ( I also don't mix it too heavy ) ... if that is expensive (people say that a lot about organics) then I don't know what to say .... fertilizer is cheaper than a sick/dead tree ....