Hello,
Thanks for your response and I am sorry for multiple posts as it was unintentional by doing it on phone.

I currently have an intermediate SUV with Budget booked from Costco rental for $386.95. My wife has a separate booking for premium car for $374 from Avis. We are planning to see and request either one for a better mpg-small-mid size SUV from either one of them. I do have AARP membership (Avis standard SUV coming at $432 with their code) but did not find it better than Costco Travel. I do have the CorporateShopping.com membership signed up with my school email-ID (I am a FT student) and this one gives same Avis standard SUV for $403 (still Costco seems better).

We both are also healthcare workers, does avis/budget give any discount or perks for that?