Let's take a look at one of your listings (in US$) when viewed on eBay.ca (Canada)
Current bid:
US $27.99Approximately C $36.08
The bid is US$ 27.99 (since you listed in US$)
which is equivalent to approximately Cdn$ 36.08
Conversion rates fluctuate and you may see a slightly different equivalent tomorrow depending if the value of the Canadian dollar went up or down in relation to the US dollar.
That number (C$36.08) of for information only - guidance for viewers on eBay-Canada.