How much should I expect to pay for Botox?

I’ve been considering getting Botox lately because every time I look in the mirror, it feels like the wrinkles between my eyebrows and on my forehead have deepened. I used to think it wasn't really necessary, but it’s bothering me because I feel like I look like I’m frowning in photos. I’ve heard people around me say that getting Botox made their appearance look naturally better, but I can't easily make a decision because the cost seems to vary quite a bit between clinics. I’m worried about places that are too cheap, but I’m curious if there is a difference in effectiveness at the more expensive ones. I would also like to know how long the effects last after a single injection and whether I need to get them frequently. Above all, I am worried that my face might look unnatural or that my smile might look awkward. If anyone has actually had Botox, please share your honest reviews regarding the average cost, satisfaction levels, and reasons why you would recommend it.