I'm looking to do a 6 day rent at LAX (8/17-8/23, so no Saturday). Prefer full size-small SUV.

I have a Cornell University employee, I sort of have a Sam's club -- my mother and I share, but card has her name. I'm a Club Carlson member.

I'm looking for the least expensive rental I can get for this time period. I got a decent rate of about $215 including tax for an intermediate SUV using the Costco codes: AWD Code: A108326, Coupon Code: MUGA049 listed on their website, but I'm not a member and am worried they will ask me at the counter, even prepaying. Can someone see if they can get me a similar rate that I won't have to worry about being rejected at the counter?

Thanks!