If you have a cellular iPad, Rogers currently has a promo where if you activate your device or change your existing plan, you can get 1GB of data for $60, prepaid for the year. Data overages will be charged at $0.05/MB.
This works out to 83.3 MB for $5/month. Normal month-to-month tablet data plans start at $5/month for only 10MB. The fine print says the offer ends February 3, 2015. Unused data will not be carried over.
If you are using your iPad for extremely light usage or as a dedicated GPS, this data plan might be worth considering. But at only 1GB, it will be consumed pretty quickly over LTE networks if you’re not careful.