An old sign Main St & Oak Ave, found under Decor/Sculptures, costs 0. You need Pets or a later pack for the items to show in your game.
Old sign Main St and Oak Ave (MediaFire)
Old sign The Highway and Nando Boulevard
Old sign Beach Parade and Greenway
Old sign Park Drive and The Pallasades
PS If you use TSRW you can alter the street names and create your own. The font used was OldTowneNo536D bold.