There are quite a few beginner acoustic guitars for sale on ebay for around 30 to 40 bucks. Is this good? I would like to buy one but I’m on a tight budget, but I also don’t want a piece of total junk. So, are these prices okay for beginner guitars? Thanks in advance!!!

Yes and no — you need to be careful of second hand guitars because if they weren’t properly taken care of the neck might be warped. When this happens you have to put a lot of pressure on the strings to get the right sound from them. It makes it hard for beginners to actually enjoy learning how to play.
I bought my kid a guitar a few years ago and it ran me a little over a hundred dollars. But you can get a new one on clearance from Sam Ash — for about $60. Please visit the link listed as my source– also you can search for music stores on the web you might come across a sale. Try to stick with nylon strings in the beginning– metal ones can cut your fingers to shreds if you haven’t built up callouses.