Plant Fertilizer, esp. Osmocote (Jefferson Parish)

Hey Gang,

I've recently been put in charge of several houseplants where I live because everyone else has a black thumb. Which is fine, but the previous owners didn't realize they need fertilizer. To that end, I'm looking for any available plant fertilizer anyone out there might have and not need, though not unrefined sources please (no composted garbage, bar guano or rabbit poop for example).

I'm especially looking for any general purpose fertilizer. Osmocote or plant spikes usually do pretty well for most houseplants, but I'm not picky, I just don't have the extra money to go and buy my own. If you happen to have any that you aren't using please let me know. I'd be happy to take it off your hands. Thanks Gang!