Newbie Question: Investing portion of my poker bankroll

[westside_eh]

Little info: I'm an 18 year old who will be attending university next september. I dont have many expenses: no cell phone, no car, and I live with my parents. Pretty much just alcohol and food lol. I have two other jobs, but poker is the most lucrative.

Obviously I never have my entire bankroll at the table at one time. That got me thinking about investing a portion of my bankroll which normally idles. What sorts of options do I have where I can quickly (within a day or so) get money out of my investment and back into the poker site if I start to run bad?

My Bankroll is at $1800, I think $800 or so could be invested elsewhere.

Given all my funds are pretty disposable, I would want a more risky then normal investement.

Thoughts?

Thanx in advance.