I took the July 2007 MCATs and just emailed all the schools that I was interested in and asked them if it was okay, along with sending them a copy of my MCAT results. a lot of schools were okay with the date, some of them gave me a waiver, like UNECOM, based on my score (35R) and others asked me to let them know what i had been up to since taking the test so they could consider waiving the date. Of course, a couple of schools wouldn't budge, but I still managed to get a fair number i could apply to.
So just do what I did and mass email all the schools and good luck!