For a budget up to $450,000 and a desire to move the next 30 days to a beach town in Florida, several locations come to mind based on the information provided:

1. Navarre: As mentioned in one of the, Navarre offers good value for its beach town experience. Navarre Beach can provide you with the coastal lifestyle and has listings around your budget.

2. New Smyrna Beach: It's noted for its affordability and is known for its small-town charm, great beaches, and surf culture. New Smyrna Beach could offer a variety of properties within your price range.

3. Dunedin: It located along the Gulf Coast and is close to Clearwater. Dunedin known for its Scottish traditions and Honeymoon Island State Park.

4. Tarpon Springs: Famous for its sponge docks and Greek heritage, Tarpon Springs offers coastal living with cultural flair and is listed as having affordable options for housing.

5. Destin: It’s on the Florida Gulf Coast and known for its white beaches and emerald waters. The median price around December 2022 was $450,000.

6. Cocoa Beach: Known as surfing hub on the Space Coast near Cape Canaveral, it has a friendly small feel.

7. Venice: This city on the Gulf Coast offers beautiful beaches and a historic downtown area.

8. **Palm Bay Offering a less touristy experience on the Space Coast, it is known for its outdoor lifestyle and proximity to the water.

9. Port Charlotte: A location on the Gulf Coast, known for its value for money when it comes to real estate.

Given the urgency of your move, ensure you engage a local real estate agent in your chosen town to facilitate a quick and efficient process. They can send you listings and set up viewings immediately. Since you're working on a tight timeline, having-approval for a mortgage (assuming you need one) and being ready with a deposit can speed up the process. Keep in mind the closing process on a home can vary, but having a local expert on your side can help navigate any challenges and meet your 30-day timeline.