Canadians and No Penny

As some of you may know, Canada has now stopped producing the penny.  We need to round up or down all of our cash purchases to the nearest nickel and I was wondering if anyone out there knows of an easy way we can accomplish this. 

We were thinking of using a slush payment method to do the rounding, however this requires our reps to have to do the calculations and they just don't have the time pre-show to spend doing this. 

Any thoughts?