There are worse tires to have for commuting!

You might look at xmart etc. for some Bell (CST) "Bike Path" tires. I've had them in a 26x1/75". They weren't bad for a $10 tire. They have a continuous bead down the center, so they don't roll too bad.
Another option is to get 1 slick and put it on the front. Then you can decide if it's worth buying the 2nd.