How can I earn 100$ (before tax) in 24 hours?

Hi, I'm am waiting for a client's payment. However, I can expect the payment by the end of the next week, so I haven't gotten the money yet.

I would like to buy something that costs about 100$, it's not necessary at all but I'd like to buy it.

The ideal scenario would be a client who pays upfront (could happen anytime). I have some electronic parts that I can sell on craigslist or ebay. Other than that I'm clueless.