I would suggest the HP LaserJet Pro M203dw Printer. This device has been around on the market for quite some time and has garnered decent reviews. Capable of automatic duplexing (A4) manual duplexing for A5, this printer fits your bill. Currently priced at $135 this printer is purchasable from Amazon.
Specifications of the printer include:
Maximum print speed of 30 pages per minute (Black)
Maximum paper size: 8.5 x 14 inches
Input tray capacity: Maximum of 250 sheets
Output tray capacity: Maximum of 150 sheets
Dimensions: 14.6 x 16 x 8.8 inches
Modes of connectivity: Wi-Fi; USB; Ethernet
Printer output: Monochrome
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