A seed bank company should have a track record of good prices, discreet fast shipping, reliability, and quality seeds. Below are the two seed banks that I have had a great experience with and can fully recommend. While located on different continents both will ship anywhere worldwide.
Located in Europe - Seedsman is one of the most well known seed banks around with over 15 years of business. Good prices, fast shipping, an expansive selection, and a consistent track record makes Seedsman my go to seed bank.
For those looking for a North America company True North is located in Canada and consistently have good promotions on seeds throughout the year.