Actually you don't need to hire a programmer to create this script.
Google "buy uber clone" and check the demo of each of these apps.

buy the one you like most and if you need any modifications, hire a programmer for that. The cost of modifications depend upon how significant they are. The quora clone which I'm working on required some big modifications. There were some features which I wanted to remove and there were some which quora doesn't have and I wanted to add. It's around 30-35 days of work. and the developer asked for $700. I managed to bargain it down to $500. Your costs are unlikely to exceed this. Oh btw, the clone app should cost you another 200-300 usd max.
Edit: Just found few uber clones that are being sold for 3-10K usd. I would suggest you stay away for these sellers are these are clearly ripping off. You should be able to find a decent app in few hundred dollars. Just keep googling.