Budget-minded growmies, how do you cut costs in your grows, knowing this is an expensive hobby?

We all know this is an expensive hobby, and you've got to be okay with shelling out cash, and there is no shortage of products, companies, solutions, etc. that are more than happy to take your money - some more legit than others. We know that cutting corners generally doesn't produce good results.

Having said all that, what are things that you have done to save money, economize your grows and your budget? Diy solutions, thrifting, used items, money saving work-arounds, etc.