http://www.econoparkexpress.com called me today. I had just signed up for their frequent parking program. The lady told me the way it works is, they sell you a card, pay for 5 days, and the card is good for 6. So that would work out to $23.75 for 6 days, or 3.95 per day. Normally $4.75. All taxes included in all the mentioned prices.
I have a day reserved at the end of this month, so I told her I would check out their lot first before I decide. It looks easier to get to than their map shows. I'll report back here after my trip !!