Greetings KG89!
Good news, I'm a highly experienced freelancer with tons of reviews and plenty of experience designing algorithms:
1. Archetype matching
2. Facebook newsfeed formula
3. School Matching
Your project is interesting and I'd love to try to tackle it. What makes it interesting is the fact there are two distinct approaches: one way is to data scrape and find data to try and estimate a supply and demand curve or to design the algorithm from the ground up with the specifications you desire. The second is the approach I bet we would take and it sounds like a bunch of fun...but that gets me to the bad news...
Bad news: Your budget is too small for this project. The bulk of the work is in the conceptualization, which will involve us co-creating and clearly defining the specs. Then I'll take those requirements and develop an algorithm that fulfills the requirements. Next will be the building phase where the algorithm is actually coded. Lastly, the test phase where we run the algorithm against various simulations to see how it would preform with real data. As you can guess all that work, to be done correctly and well will cost more than $250. I quoted you $500, but that is just to highlight my bid a bit. We should talk about what you can afford. I'd like to work with you because I find projects like yours fun and rewarding.
Cheers,
SstatsC