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Well, you can buy an Arduino clone for under USD $5.
If you get a Arduino Pro Mini, you'll need to add to that an FTDI chip (to go between your USB port and the board's inputs)
If, on the other hand, you get a Arduino Nano, you just need to download the Arduino IDE and you can get started with a simple light-blinking demo, using the onboard led.
Grab some breadboards, bread-board connection cables, a display or some other peripherals and you're ready for fun. You should be able to get started for under USD $20. I got a 128x160px colour screen with SD card reader for about $6 or $7
Here's some clones: Arduino Nano clones
It's a lot of fun and rather addictive.
"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon
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