If it's just cheap and affordable you're looking for, take a look at the MSP430 LaunchPad. Less than $5.
The $4.30 (+shipping) looks to be a promo price, since you get the whole thing in a box, along with a mini USB cable. I doubt they would sell you several at that price. You get a device that looks to require the included programmer to modify it. With Arduino boards, you either have a USB on the board, or a header for connecting an FTDI serial cable to (or anything else that does 5V serial). The development environment is a commercial trial version, apparently only for Windows.
Once I get back into microcontroller stuff, it's a clear choice to get an Arduino-compatible board. It's going to be around for a long time, tools are going to be there, people who understand the boards, etc. Saving a few dollars on some obscure thing like this one from TI just doesn't seem worth it. For $13 you can get the Arduino-compatible RBBB kit which includes PCB, programmed chip, and parts.
Arduino didn't win because its Arduino, it won because it used a microcontroller that had already cornered the market.
That's how it always seemed to me. The bare-bones Arduino-compatible boards are little more than an Atmel microcontroller and voltage regulator. There's nothing surprising about this, since microcontrollers pack everything: CPU, Flash ROM, RAM, I/O, ADC/DAC, counters, interrupt controller, low-power mode. It seems that it's the complete package and network effects that make Arduino valuable. Each part of the package benefits from the others, and the standardization allows easy sharing of people's programs.
I agree, does this not rely on the developer actually specifying the contract? Also, would it not be possible to have bugs in the contract itself?
What would it mean to have a bug in the contract?
I've just had this kind of scary revelation. This and another thread have people criticizing something up and down, even though they haven't read about the thing and their critiques aren't even of the thing, but their flawed idea of the thing. It makes me wonder whether virtually all the threads here are like that, just that it's not always as obvious. Ugh.
"God is a comedian playing to an audience too afraid to laugh." - Voltaire