Interesting product. Important point is that these are the initial versions, without jumbo frame and diagnostics details. still, for the money, they are pretty interesting.
MikroTik S+RJ10 SFP+ RJ45 10Gbps Copper Module | eBay
39$ us$ each list price, but I did a best offer of $30 ea. for quantity 4 and it was accepted in a day. Decent shipping changes to Canada
https://www.servethehome.com/mikrotik-srj10-review-convert-sfp-to-10gbase-t-inexpensively/
MikroTik S+RJ10 SFP+ RJ45 10Gbps Copper Module | eBay
39$ us$ each list price, but I did a best offer of $30 ea. for quantity 4 and it was accepted in a day. Decent shipping changes to Canada
https://www.servethehome.com/mikrotik-srj10-review-convert-sfp-to-10gbase-t-inexpensively/