I'd roll the dice. Since they're probably gonna can you as soon as you give notice, wait 'till you have the commission money and then give yer 2 week notice. Profit!
This is what I would do as well. If they are going to fire you right after you give your 2 weeks anyway, you aren't hurting anything by waiting until your comission check clears to give notice. They'll say, "See ya." And you'll say, "Thank you very much."