When the lira was replaced by the Euro in 2002, the exchange rate was 1€ = £1 936.27. So, yes, a cup of coffee would likely set you back a couple of thousand lira. The smallest note was £1 000.
Plus, the federal GST and the provincial sales taxes are not built into the price, but are added at the till, so there’s no point in trying to set the price in a round number.
There’s another technique you can use on your way to wealth. Since the rounding to a nickel only happens on cash purchases, you should pay cash when the rounding is going to be down and debit card when the rounding would go up. This is my main retirement savings plan.