Find sales, routing and any type of workflow advance we can use, we try to find those that make our life easier.

Here are just a few we like:

1. GSALR - Garage sales by map
2. EstateSales.net 
3. YardSales.net 
4. Craigslist.org 
5. ZeoRoutePlanner - optimizes your routes. Hat tip to @shedflips. You can check out this youtube video where they explain their strategy.
6. Google Alerts - use keywords with town names you are looking for.