Real-Time Used Cars Market Crawler

I need an expert in web crawling to build me a real-time crawler that can extract specific data about the used car market in Brasil. Here's the rundown of what I need:

Data to Extract:
- Car make and model
- Year of manufacture
- Mileage
- Price

Sources to Extract From:
- Online classified websites
- Dealership websites

Crawler Features:
- Ability to set a price range filter
- Ability to set a location filter
- A car condition filter

Based on what the crawler found, suggest a price for a specific vehicle.

Ideal Skills:
- Proficiency in Python or other leading programming languages used for web crawling
- Having previous experience in creating crawlers that extract data from multiple sources
- An understanding of the used car market will be a plus.

The crawler should be able to provide real-time updates for the fastest possible notifications.