Most of my Micros cost less than $100 (Or in my case - £75)
Hubsan X4 H107 - £30 (Around $40)
This was my first quadcopter. It's pretty perfect for beginners I think. Very robust. Great indoors and out. Can handle high wind. Has great range. Decent flight times. Can even fly in rain!
Syma X5C - £45 (Around $55)
Great for anyone who is interested in the Phantom range, as I was before I got it. Also great first filming platform. Very robust. Great for outdoors. Can handle moderate wind. Has good range. Decent flight times. Can be modified for FPV.
Eachine X6 - £45 (Around $55)
Great micro-hex. It comes equipped with a camera. Not very robust though. So not ideal for beginners. Good for indoors and out. Can handle moderate wind. Range is great. Flight times are okay but it takes a square lipo, as opposed to the usual rectangular lipo.
Hubsan Q4 - £25 (Around $30)
Surprisingly good for it's size. Handles well outside and inside. Decent range. Can handle high wind. Robust for it's size, but not as much as bigger quadcopters. Flight times are pretty good. You cannot swap lipo's though. Makes it more suitable for indoors.
Syma S6 - £15 (Around $20)
One of the smallest helicopters in the world. Great for indoor use. Flight times are good. It can wobble a lot though due to it being so small and not a quadcopter. Very robust. Can't swap lipo's. Range is limited to whatever room you're in.
Eachine CG022 - £20 (Around $25)
Has a single interesting feature. It has a 'headless' mode. Great range. Not very robust though. It's propellers are very brittle. They are very likely to break if you crash. The quadcopter can be unresponsive at times too.. The lights on it are very nice. Good for night-flight. Flight times are decent. Can handle moderate wind.
Parrot Rolling Spider - £90 (Around $115)
Costs more then you'd like to pay, but is worth mentioning. This quadcopter has a sensor on the bottom, which helps to hold it in place. I've had it outside just once and it did drift about. But it was windy. You use a smartphone to fly it, which is rather unique. It has a camera on the bottom, which is primarily to see the ground. But it works as a camera too. It's range is limited, due to it working via Bluetooth. It can fly in strong winds though. It's prop-guards are also wheels. So it can drive like a car on the ground. It can also roll up walls and on the ceiling, hence it being called the 'Rolling Spider'. It uses a unique battery and propellers. So you will have to pay out for spares, instead of using what you may already have. It has an auto cut-off feature which can be disable when the prop-guards are on. This is to prevent motors burning out, should you get stuck or invert.
Hubsan X4 H107D - £85 (About $110)
Also more then you'd like to pay (And when I last checked Ebay, WAY more then I paid. I've seen them for $300 now!) but also worth mentioning. The FPV isn't great for outdoors if you ask me. This is because looking at your screen can cause you to lose the quadcopter, is it's so small in the air once you fly some distance away. Indoors however, it's quite impossible to lose and I've been able to fly it from my room upstairs, to the living-room downstairs without the video dropping out (Even though it is designed to be LOS) The camera and monitor are still good outside for 'peeks' - To see what it looks like up there. But really you should look at the quadcopter and not the screen if you don't want to crash. The quadcopter itself is very, VERY robust. Great for indoors and outdoors. Great in very high wind. Flight times are okay. Better if like me, you strap on a 720MaH battery. Good for beginners I think.
These are all of the smaller craft I have. They're all good in their own ways. But I do prefer some to others. My Syma X5C is the quadcopter I let friends try and fly. My Hubsan X4 H107D and Eachine X6 are what I fly outside most days for fun. My Rolling Spider is the main craft I fly indoors. The others get used less these days. Anyway, this took AGES to write, so I hope someone reads it, lol!