Amazon has quite a range of copy stands from under $100 to many thousands of dollars. You get what you pay for though. The more you pay, the more stable the stand. I use an inexpensive stand myself that I weight with sandbags to improve stability. An advantage of a copy stand over a tripod is that the camera is pointed down so it is easier to position your specimen for photography.
I used to use a professional grade tripod before I got the copy stand. This tripod had an accessory outrigger that replaced the pan-tilt head. The pan-tilt head was then attached to the end of the outrigger so the camera could be pointed straight down. This set-up would be pretty costly so it probably isn’t an option. I don’t believe the low end tripods have this kind of accessory.