Hey Rami,
There are a few bigger name wholesalers in town, typically it's silent auction style at the property. If you invest in the surrounding counties, like Hunt, Johnson, Kaufman, etc, you can still get some good deals from big wholesalers. If it's the cities that everyone wants (Garland, Plano, Arlington, Ft.Worth, etc.) you will typically be competing against a lot of other investors. Some do first come, first serve, which typically means first investor to get deposit in hand or wired over gets the property, but you have to be able to run numbers really quick or know the area of the property really well, because they can go in minutes to a seasoned investor who knows the area and doesn't hesitate to send deposit.
It sounds like you want to avoid that and find an independent wholesaler who you can create a personal relationship with. Best way to meet independent wholesalers is REIAs and local meetups, just start talking to people. You will eventually find someone who is wholesaling or you will find someone who is not a wholesaler, but has a property they are looking to sell. Sometimes an investor is stretched too thin and they are looking to offload a property, you can get good deals this way and make a relationship with someone who is actively investing. Talking to RE agents is another good way to find properties as well, if you find a good agent they come across fixer upper properties quite a bit and can pass them your way.
Hope that helps, happy investing!