Wedding guest transportation options

Hi folks! I am trying to find an affordable option to transport ~30 wedding guests from Katy to Houston for one of our wedding events. One of my friends in Austin used this app called Fetii and she was able to rent a mini bus for about $60. Unfortunately, it looks like they are not available in Houston, and all the companies that I've checked with are saying it will be like $700-$1,000 to rent a mini bus for an evening. Does anyone know of an app or service that is available that is available in Houston which would be less expensive?