My 2 cents:USB to serial for $ 7.50http://dx.com/p/ftdi-basic-breakout-arduino-usb-to-ttl-upload-tool-for-mwc-black-142041Shipping is free, if you can spare the time to wait three weeks it's a good buy, I got a couple and have used them without problems.
and none are consistent with the adafruit FTDI Friend, if that matters.http://www.adafruit.com/products/284IOW, headers on pcbs that currently accept FTDI Friends, or the std FTDI Cables[ie, the first original devices], may not accept those not-quite-a-proper-clone boards.
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