Can you have shipping price listed as TBD?

Hello!

We are a vintage furniture store. We typically calculate our shipping post check-out and invoice our customers separately since we have a number of oversized items with differing shipping requirements. 

We've set up a pick up option as well as a shipping option at check out. When folks agree to the shipping option, it says FREE since we don't calculate it at the time of the purchase. We do include language saying that we'll reach out with a shipping quote. Would there be a way to have that say TBD instead of FREE? I hope this might eliminate some confusion we've been having recently. 

Thank you so much in advance for your help!