This probably isn't helpful for those in Houston, but for those that travel or live in cities where Lyft is available, here is a $50 ride credit. https://www.lyft.com/invited/RIDESHAREKING If you already have the app installed, but haven't used it or a code. You can enter code RIDESHAREKING for the $50 credit.
I used a Lyft code recently while in DC. I think they're all the same - 5 rides with a credit of up to $10 each.
