I have bought many items from mp4nation. Pretty good service and 30 day return policy. They ship from Hong Kong/Singapore. It's normally a couple weeks for free airmail, with a tracking number. There's Fedex and EMS shipping options to get things in a week.
I currently have the HM5s and E10. But, I wanted to get something more portable like their flagship Brainwavz B2 (preorder price of USD$109.5 from USD$170). Since I read Brainwavz M4 is like B2 with more bass, I decided to get M4 instead. They dropped the price to $28 to celebrate their new website.
The new website has a points and referral system, for each 50-word review you get 100 points (USD$2) which you can then apply for subsequent purchases. I wrote 4 reviews for past orders and I received USD$8 (400 points) to spend the following day.
ClieOS gave a rating of 4.2/5 for M4's sound quality, and 4.75/5 for its value when priced at USD$70. He has reviewed over 150 In Ear monitors. He's said USD$28 is a steal for Brainwavz M4.
http://www.head-fi.org/t/541204/concise-multi-iem-comparison… (warnings: not for dail-up/slow internet users)
http://www.head-fi.org/t/606070/review-brainwavz-m4
Another review found in mp4nation forum. Many mini reviews can be found inside the first post.
http://www.mp4nation.net/forum/f46/brainwavz-m4-review-photo…
You're welcome to search for more reviews, on head-fi.org or other forums. They are mostly positive, except a few issues with a few people who mistakenly got the mic version which may not be compatible with certain audio jacks. Same price for mic and no mic versions. They are identical, except the mic and audio jack compatibility. I recommend the version without the mic, unless your device supports earphones with mic/remote control.
If you're okay with referrals, please use the link below.
http://www.mp4nation.net/rewardsref/index/refer/id/9916/
Referral code:763532
EDIT: USD$28 is about AUD$29.56 via Paypal.
+1 on MP4nation.. I bought the Brainwavz B2 from a promotion in Spring last year. Unfortunately one of the headphones stopped working intermittently despite me being very careful (always using a protective case when not in use etc). MP4nation have been great so far though, answering all my queries about RMA in 24 hours.. I need to wait for new stock to come in, but am hopeful that this will be a fairly painless process.