Red Eyed Tree Frogs don't make good beginner frogs because they die really easily. Kind of like keeping a chameleon vs a leopard gecko. A Whites Tree Frog will be more forgiving of beginner mistakes, so if their tank is too dry or too humid, they will be able to tolerate that for a time, until it is corrected. A Red Eyed Tree Frog won't be so tolerant of mistakes and you may just find it dead the next day.
With them, it's not just about keeping the tank a constant temperature and humidity, the tank needs a daily cycle of their humidity and temperatures.
In my area, a Whites Tree Frog will cost approximately $30-60 + tax. That is what I've paid for mine. A Red Eyed Tree Frog in my area will cost approximately $65-85 + tax. That is what I've paid for mine.
This is another reason why RETF don't make good beginner frogs, they are twice the price of the Whites Tree Frogs, so if you make a mistake with them, it's a costly mistake.
If you want to jump right into getting RETF by all means, do it. Just be aware of a few things when you do get them:
1) Buy these from a breeder, not from a pet shop. This is a type of frog that you want to get from a breeder, no exceptions. I've bought quite a few from pet shops, and they usually don't do well. Even if they look healthy, you just never know what they've picked up along the way. The frogs from pet shops are usually wild caught. The average life span of a WC RETF is about 1-5 years. The average life span of a CB RETF is 12 years.
I've posted a link to "Rainforest Junkies", he's a frog breeder (USA) and breeds RETF, Albino RETF, and two other similar species. I've heard nothing but good reviews from people that buy their frogs from Mike Novy and his staff.
Red Eyed Tree Frogs from Rainforest Junkies: Regular = $25, Albino = $50
2) These frogs are nocturnal, don't expect to see them up during the day. They get up after lights out, and go to bed before the sun rises. Mine are usually up around 11pm/midnight, and go to bed around 6am-7am. I see them awake when I get up at 5am to get ready to go to work. The rest of the time, all I see is a sleeping green frog.
3) These frogs are territorial, and do territorial displays to the other RETF in the tank. They shake the branches as a display, and I do believe that they wrestle if their point is not getting across. Be sure not to overcrowd them, and provide plenty of branches, cover and hiding places
4) When misting the tank, only mist at night; during the night, at lights out, or early in the morning. When these frogs sleep, they have a protective coating on their skin that protects them during the day from drying out. When this coating is sprayed by water, it comes off. This will cause the frog to stress.
A lot of book and care sheets that you will find about RETF will tell you to keep the humidity around 80% or higher. This is not always a good thing to do with them. Tree Frogs are very susceptible to bacteria infections, and the increased humidity will make it worse.
I keep my humidity in my RETF tank around 50%, and the days when I mist the tank (at lights out) the humidity will go up. There is a large water bowl available to the frogs, so it they need more moisture, they can go down to it for a soak.
Remember, when misting the terrarium, mist the tank, NOT the frog.