I can try to make you one. I have never worked with twitter API but I think I can handle it. If you can afford to tweet every 5min you can use free hosting at
http://www.000webhost.com/ (I must check first if they really support everything needed in free version). I am using this page for my parsing project and it is working smoothly.
If you want to use it on your VPS then usually you need php, curl, depends on which technology you would use.
About price I don't know something about 20$ would be ok I think.