Tons of electronics outlets in the US have them available now: Mouser, Digikey, even MicroCenter at their retail outlets.
Best price that I've seen is from MCM Electronics. http://www.mcmelectronics.com/content/en-US/raspberry-pi&?&gclid=Cj0KEQiAnvfDBRCXrabLl6-6t-0BEiQAW4SRUKZ7nFy-fE_5eD3r5LZiw2V-Qa1z8SrIuimqcX2OaqkaAv1r8P8HAQ