Raven Concealment debutted a new IWB holster. It uses velcro strap to adjust retention.
Available for following guns(for now)
Glock 17, 19, 22, 23, 26, 27, 31, 32, 33, 42, 43
S&W M&P Full size 9mm/.40 cal and Shield
Link:
http://raven-concealment-systems1.mybigcommerce.com/morrigan-iwb-holster/
Price $49.99
From: Raven Concealment Systems