For the USA, you can get it from:
www.classicbikebooks.com
For UK, Europe and rest of the world, you can order it directly from the RealClassic website :
www.realclassic.co.uk
It is an absolutely delightful magazine, with significant content from reader contributions. I highly recommend subscribing to it. Special thanks to Rowena at RealClassic for all her help and being just wonderful! She didn't snip a single word from my long and painful story! Now that's support you won't find anywhere.