Not sure if this is old news but I’ve found and confirmed that a number of common recommended TBCs have already or will be going end of life very soon. AV Toolbox’s website has the following notice posted on the product page:
EOL NOTICE
The AVT-8710 has been scheduled for End of Life. This product will remain on our price list, and will continue to be available until July 2018. If you need a AVT-8710 for your project, please contact your sales representative.
http://www.tvone.com/avt-8710-time-base-corrector
I inquired to confirm and the reps confirmed that this product and the 1T-TBC and 1T-TBC-GL are also going EOL. The reason according to them is that one of the main components within these units is being discontinued by their supplier.
While I doubt there’s currently any shortage of these products, it’s clear they won’t be produced much longer.