There were 2 releases of the 1.0 series. The first release contained:
In the 2nd release, the Eye of the Dragon, Royal Tiger and Juice were replaced by the Fireball, the Commando and the Midnight Blue.
The best place to find the newest Myachis is the official myachi website, though there are a number of online retailers that carry the product and may have older series. You can also find Myachi in a number of stores across the country. If you search "Myachi Locator" on googlemaps you will find an extensive and up to date list that shows the exact location of over 200 stores that carry Myachis all around the world.
All Myachis are retired after a few months so any Myachi you acquire will be rare within a few years of purchase. To find rare Myachis you are best off checking online Myachi forums where long time collectors will often offer Myachis for sale or trade. There are usually a few rare sacks on popular auction sites as well.
A series of 10 books is commonly referred to as a decalogy.
Bentley made Series 10 guitars.
Nature - TV series - was created on 1982-10-10.
Vincent - TV series - was created on 2005-10-10.
Intelligence - TV series - was created on 2006-10-10.
Enlightened - TV series - was created on 2011-10-10.
Tenafly - TV series - was created on 1973-10-10.
Dreams - TV series - was created on 1984-10-10.
Backyard Sports series was created on 1997-10-10.
Myachis are rectangular bags of fabric filled with sand (called "Secret Sauce" by the company). They are made from a number of different fabrics, but the most popular are corduroy, microsuede, denim and velvet.