I currently take my mountain bike 8 miles to the next town for weekend trips (store, farmers market, etc). I'm debating whether or not I should buy a beater road bike and fix it up or just deal with the more difficult ride of my mtb. Anyone have suggestions?

I was thinking of getting an old road bike (most ebay ones end up being "vintage" aka SH*T) but now I don't know. I then thought of buying smooth tires to switch out with when i go on my longer rides.

what do you think?

thanks in advance