How much should I expect to pay for Botox?

Lately, whenever I look in the mirror, I find myself a little self-conscious about the space between my eyebrows and the area around my eyes.
I used to just think it was because I was tired, but now that I notice slight wrinkles even when I'm not making any facial expressions, I've started looking into treatments. I've heard a lot of people around me talking about Botox, so I became interested, but when I actually tried to look into it, the cost was what I was most curious about.

I know that Botox costs vary by area, but what is a typical budget to expect when starting for the first time? I'm also curious whether it's better to get treatments on one area at a time, like between the eyebrows, on the forehead, or around the eyes, or to consult about all the necessary areas together before proceeding. It's actually confusing because the prices seem to differ quite a bit from clinic to clinic.

If anyone has had Botox, could you let me know roughly how much it cost? I'm worried about places that are too cheap, but I'm also hesitant to go to a place that is too expensive right from the start. I'd like to hear some realistic reviews regarding satisfaction levels and costs.