There is an advantage to picking a few specialty areas and knowing those areas really well.
Finding great deals at garage sales is all about volume. You need to be able to move quickly from house to house. Once you have experience, as soon as you walk up to a garage sale you’ll know if it is a dud or potential gold mine.
Most anything decent at a garage sale will be gone before 10 am, if not earlier. There will be others out there looking to resell items so it will be important to beat them to it.
Items such as DVDs and video games are usually light enough to be shipped first class and you can package them in a basic bubble wrap envelope that can be bought in bulk.