There is no option to buy the regular straight balsa counters. Also that is the only option for the other counters. This doesn't make sense.
Having a Baby in The Sims Mobile [Complete Guide]
Heirlooms: How to Get & Heirlooms List
SimCash: Tips for Farming Simcash
Babies & Kids (objects)
Indoor Plants (objects)
Writing Hobby: Tips & Rewards
Miscellaneous Decorations (objects)