I will also say that I grow organic. I'm not saying you have to go that way. I just prefer organic bud. I have a worm bin and compost pile. I got all the chicken and cow manure I would ever want.
If you need synthetics I am a fan of dynagrow. For $20 or less you get a sample pack from them. It comes with a quart of foliage pro 9-3-6, a quart of protekt (silica), a pint of bloom, pint of mag pro and pint of rooting solution. The foliage pro is geared towards cannabis they just didn't want it labeled as such.
I got the kind samples for 12 bucks shipped.
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I got this pack free from rxgreensolutions. They advertise here. I had to email a couple people in their company before I got them free.
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The dynagro sample kit will last you a long time if growing a couple plants at a time.
I spent a couple days emailing nutrient companies and you would be surprised at the free or cheap stuff you can get. All that is needed is a little time and effort.