Amazon has the TP-Link TL-SG108-M2 on sale for $149.99, free shipping. This is an unmanaged switch with 8 ports, each capable of 2.5G/1G/100M speeds. It is a fanless design in a metal casing and as part of their business-class product line, it is backed by their Limited Lifetime Warranty.
I believe this is the lowest price so far since the switch was released. At <$19/port, this is a great way to get started with 2.5G / multi-gigabit, or to expand from a smaller 5-port to 8-port.