I saw an old posting where @fridayojonimiisaiah was looking for something like this. On my rental site, we allow listings to be priced by Day / Week / Month or “Contact Owner for Pricing”
Involved two new listing attributes and a little code. If you (or anybody) is interested, you can check it out at ArubaBNB.com
Thank you for your solution. It will be useful for our community. If you have the possibility, please share the code so that other members can use it too.