This is rather simple to develop actually.
If you want it done with Google Spreadsheet, it could refresh automatically at a given frequency (each 15 mins, hourly, etc.).
You would need some server environment (shared hosting would work) to host the process.
I can give a hand, but I'm swamped with work and really just wandering around on the forum because I have some free time during the holidays.
My rate isn't cheap neither; I would charge around 0.010725 BTC for such a project (and host it somewhere on a server of mine for you for 6 months). But just wanted to give you a heads up on this.
You can probably find someone who would be much cheaper on Upwork. Just give the same project description as above and take the cheapest proposal! Be careful with people from India as the quality of their work is generally not that good (I'm talking from experience here; has been using Upwork/vWorker/Rentacoder for more than 10 years). Really just a rule of thumb; I have nothing against them.
Good luck!
