https://www.techpowerup.com/304263/sharkoon-releases-m30-black-m30-rgb-cases
 
Sharkoon Technologies is an international supplier of high-quality, high-performance PC components and peripherals. With the M30 Black and the M30 RGB, Sharkoon introduces new models, following on from its popular M25 series. Thanks to its unpretentious yet elegant design, the M30 Black should be able to be integrated harmoniously into any work environment. The M30 RGB, on the other hand, should primarily appeal to gamers thanks to a gaming-styled look with an RGB fan and a side panel made of tempered glass.

Both the M30 Black and the M30 RGB have an elegant, rather minimalist appearance with a clearly purposeful design. The center of attention is the front panel with rounded edges and a large perforated, mesh surface that should enable a strong airflow. Near the front of the top panel, both case versions have a modern USB Type-C connection for fast data transfer. There is also a generous amount of options for cooling: Each case offers space for up to seven 120-millimeter fans, and if the installation of a water-cooling system is desired, there is enough room for a radiator with up to 360 millimeters either under the top of the case or behind the front panel.
 
Perfect for the Office…
Two new SilentStorm BW120 PWM fans are already pre-installed inside the windowless M30 Black: one on the rear panel and one behind the front panel. The fans, which are also offered separately by the manufacturer, completely do without RGB illumination and are designed for operation in work environments thanks to their fluid dynamic bearing, adjustable 1,400 revolutions per minute, and interchangeable vibration dampers in black and white.

...or for Exciting Gaming Sessions
As with the M30 Black, the RGB version also has a SilentStorm BW120 PWM fan behind the front panel. However, the rear panel has been equipped with a 120-millimeter PWM fan which has addressable RGB LEDs that can be controlled via the included RGB controller to provide effects and adjust the color. The built-in hardware components can then shine through the side panel made of tempered glass.

Lots of Room
Both case versions offer space for graphics cards with a length of up to 38 centimeters, and there is room for a CPU cooler with a height of up to 17.2 centimeters as well as a power supply unit with a length of up to 22 centimeters. In addition, a total of two 3.5-inch hard drives or four 2.5-inch SSDs can be installed.

Price and Availability
The M30 Black midi-ATX case is now available at the manufacturer's suggested price of 69.90 euros, and the SilentStorm BW120 PWM fan for 8.99 euros. The M30 RGB case is available at the manufacturer's suggested price of 79.90 euros.

For more information, visit the product pages of the M30 Black case, M30 RGB case, and SilentStorm MW120 PWM case fan.
 
These cases are very good and each one is less than 80 Euros.