I’m posting this one because for the first time I’ve seen, this is next-day shipping w/ Prime at a good price (it’s the same price as the Euro DK seller which prices lower the primary unit but adds in $23 for shipping). You can get this one, quickly, and not have to wait 1-2 weeks.

https://www.amazon.com/MikroTik-CRS305-1G-4S-Gigabit-Ethernet-RouterOS/dp/B07LFKGP1L/ref=as_li_ss_tl?pf_rd_r=05E7JR9N1ZWYPH6GGGW3&pf_rd_p=be25f964-4afb-442f-819e-9e628b270a7c&pd_rd_r=ae705b12-8d71-412d-8f3d-27204e00652a&pd_rd_w=s6gQs&pd_rd_wg=DK8Sn&ref_=pd_gw_ci_mcx_mr_hp_d&linkCode=ll1&tag=rtclub-20&linkId=e3a0016a953c5b3a537e25241ac624dd&language=en_US

• The CRS305 is a compact yet very powerful switch, featuring four SFP+ ports, for up to 10 Gbit per port
• The device has a 1 Gbit copper ethernet port for management access and two DC jacks for power redundancy, plus it’s very sleek and compact metallic case without any fans, for silent operation
• It has a “Dual boot” feature that allows you to choose between two operating systems - RouterOS or SwOS. If you prefer to have a simplified operating system with only switch specific features, use SwOS
• If you would like the ability to use routing and other Layer 3 features in your CRS, use RouterOS. You can select the desired operating system from RouterOS, from SwOS or from the RouterBOOT loader settings
• 800 MHz CPU nominal frequency, 141 x 115 x 28 mm Dimensions, 512 MB RAM, 16 MB Storage size, 802.3af/at PoE in

And confirmed by Monkey in RT, you can use the Eth/Boot port as an uplink to your primary network switch.