The cheapest tactical pants that are good quality are the CQR tactical pants model TLP-104/103. I just bought a pair for $30.
I have 4 or 5 pairs of tactical pants and the CQR are as well made as my 5.11 Stryke pants which cost $75. They have been worn many times and washed just as many and still look brand new. The stitching is doubled and the fasteners are heavy duty and will last many years. The fabric is 65/35 Rip-Stop and I have to say this fabric is awesome! It’s lightweight and tough. I bought the 30W 30L size and they fit perfect. They are a more slim fit but are not tight. You can easy run, crawl and climb in these pants. I have always hated bagged pants.
Check them out here….CQR Tactical Pants at Amazon.com