Today’s BlackBerry Deal of the Day is Mobile Checkbook for BlackBerry from Mobatech.

Mobile Checkbook lets you record transactions as they happen. With this powerful BlackBerry software, you will never again be without your up-to-date account balance! Whether you’re in the car, at a restaurant or out shopping, Mobile Checkbook gives you immediate access to your current account information from anywhere at anytime.

Mobile Checkbook normally runs $12.95, but, for today only in the RIMarkable Store, you can get it for the 50% off Deal of the Day price of $6.48.