A quick search led me to https://www.roc-noc.com/mikrotik/router ... TC-US.html looks like they are US based.It is https://www.multilink.us
I couldn't find a supplier with a decent price for this install in the US. Shame.
Baltic is my regular source for Tik. But they can be out of stock for months at a time. It took over a year for a wAP LTE-Kit to show up there.If you're in the US, Baltic Networks usually has pretty good deals, such as 10% or more off Mikrotik's MSRP.
https://www.balticnetworks.com/mikrotik ... ap-us.html
It's out of stock right now but you can still pre-order.