the option for shipping a packet is gone
Canada Post is involved in a labour dispute and eBay has seen fit to remove postal service for the time being.
This may be an excess of caution because the workers are at the moment just refusing overtime. They may move to "work to rule" or the management may go on strike and lock them out.
You can still use UPS or FedEx shipping which are much more expensive.
Or you can go to the Canada Post site and buy labels there.
If you have a Solutions for Small Business account, Canada Post gives you discounts from counter prices.
https://www.canadapost-postescanada.ca/cpc/en/small-business.page
now we're being charged the same price to ship a small item like a dvd or blu ray and smaller that could fit a bubble envelope as a 1 kilogram package , why ? ,
Capitalism charges what the market will bear.
The companies also must make a profit for their shareholders.
Many people think Canada Post should be privatized, raise their prices, and make profits for their shareholders.
As a Crown Corporation, Canada Post is mandated to at least break even and any profits (most years since 1974 they have been profitable) the excess is turned over to the Canadian Treasury.