1. Waste of time is the most extravagant and costly of all expenses. 

2. Would it would be too extravagant to buy both?

3. I felt very extravagant spending ￡100 on a dress.

4. I can have a brainstorm and be very extravagant.

5. He ran up stupendous debts through his extravagant lifestyle.

6. Don't be so extravagant, spend your money more carefully.

7. She courts publicity by inviting journalists to extravagant parties.

8. She's got very extravagant tastes.

9. Residents were warned not to be extravagant with water, in view of the low rainfall this year.

10. We are not extravagant; restaurant meals are a luxury and designer clothes are out.

11. That was very extravagant of you to buy strawberries out of season.

12. He had a wildly extravagant lifestyle.

13. The firm is big on extravagant promotion drives.

14. He is extravagant in behaviour.

15. Her Aunt Sallie gave her an uncharacteristically extravagant gift.

16. Who is footing the bill for her extravagant holiday?

17. Extravagant spending soon depleted her funds.

18. His extravagant ideas were never brought to fruition.

19. In his youth he was an extravagant epicurean.

20. He rarely used taxis(sentencedict.com), which he regarded as extravagant.

21. The holiday was an extravagant indulgence.

22. He was extravagant in his admiration of Hellas.

23. Their extravagant life-style plunged them into debt.

24. You mustn't be so extravagant with other people's money.

25. They may make extravagant shows of generosity.

26. She scandalized her family with her extravagant lifestyle.

27. Don't be afraid to consider apparently extravagant ideas.

28. Don't be too extravagant with the wine.

29. I was embarrassed by all the extravagant praise I was getting.

30. I go to that restaurant for lunch if I'm feeling extravagant.