Tactical Pants
Tactical pants are not that hard to find, but if you are looking for cheap ones then you are not going to find high quality ones. You need pants that fit your needs and if you are a professional or a serious amateur then spending a few extra bucks for good tactical pants shoud not be the first worry on your mind.
Don't try to find the cheapest model that you can, but instead try to find a affordable tactical pants that come with the options that you are looking for. You need to make sure that they are comfortable, durable and most of all they should suit your needs. For some professions there is need for even extra pockets than the traditional 5.11 tactical pants provide and you might want to look in to tactical cargo pants instead to find what you are looking for.
Although you should not make such a clear difference between these two since they can both be found with the same options and the same quality. What you need most likely is a pair of pants that is not 100%-cotton, because those are mainly meant for regular use. Find pants that are meant for heavy duty use and are made out of a material that is supposed to be durable, comfortable and weather resistant. You will learn how to appreciate the fact that your pants are waterproof once you spend a few nights in the rain wearing them.
The material is not everything you need to take a look at, but also the overall quality of the product. Look for triple stitches and ones that have special stitches around the knees and other parts where there is constant wear and tear. You will want them to be also shaped to fit - the traditional straight leg may be more conservative, but when you look for function you don't want your pants to have a straight leg. Tight ankles and especially around the legs you need the pants to be a nice fit - any loose fabric can cause problems in different situations.
If you work a heavy outdoor work you will most likely have to get them made out of a canvas material that is not purely cotton, even though some of the cotton pants are made to last. You want the pants to last for at least a year of daily use, and the cheapest tactical pants don't last this long. You will need to get two or three pairs of them and in the end you would have been better off with the more expensive high quality tactical pants in the first place.