My current spreadsheet tells me I've spent:
$2,900 on applications fees alone.
I have another tally which I've been keeping track of ALL expenses from this process (Kaplan prep course, MCAT fees, CASPer fees, additional credits at a local university, apps, interviews, etc....) and it's just about to tick over $12,000.....
My advice, have at least $5,000 saved for the applications themselves plus airline travel to at least 2-3 interviews.