The change was announced
one year ago on eBay.com. eBay delayed the implementation until early January to give sellers a chance to revise their listings.
The same changes are finally coming to eBay.ca. No surprise here.
I had to change 2,700+ GTC fixed price and store inventory listings, one at the time. Painful and time consuming.
There is no additional cost if you plan it well. It is a matter of cancelling GTC listings near the end of the 30 days cycle and relist with the modifications.
If you did not plan it well, it will cost you a few dollars. No big deal.