Looking for rental (Treasure Coast)

Hello, I'm a single mother with a great job, my last place the owners decided to sell after the lease was up and I wasn't prepared for that.
I have good credit and have been preapproved to purchase but only for about 230k nothing in that price range also I can't save for down payment because I'm basically using my whole check to pay for a hotel room.
I paid 3k for an airbnb the month of December so we could have a decent Christmas and if I don't want to stay in a roach motel with drug dealers, I'm paying $150 -$200 per night.
,.
leaves me nothing to save for first, last, security.
This is my last resort, I do not have any living relatives to ask for help, I cannot leave to more affordable area because of my children.
Please if you have been in this situation before and have any ideas or know of any place that can help, I'm desperate.
Thank you in advance for any helpful tips Ideas or places willing to work with move-in cost.