no smaller sizes (only bigger ).
I need a 16 port switch, but not for 200 euro. Which one are supported by OpenWrt?
D-Link DGS-1210-16 is slightly more than 100€ in Germany, make sure you buy the right revision.
The 28 port version is another 30€.
While the ZyXEL gs1900-24e isn't supported by OpenWrt yet, it shouldn't be toooo difficult to get that one working (depending on your experience, https://github.com/RaylynnKnight/openwrt/tree/ZyXEL_GS1900-16 probably provides a good basis already).