Help - I'm confused! If the DRV of Vitamin A is 2500 IU's, why can I not find that in a supplement?

Hello - I have spent the best part of an hour research Vitamin A. The DRV for women is 2500 IU's of Vitamin A with at least 20% as beta carotene. I have looked on vitacost, iherb,puritan's pride, and drugstore.com - and all I see is 10000 IU's and 25000 IU's. Can somebody please tell me where I can find the DRV in a supplement only (not contained in a multi-vitamin)? Thank you!