I had the same anxiety you have when the pharmacy quoted me $2400 for a 30 day supply of Gleevec for my mom and she does have insurance. If you haven't found assistance for the Gleevec yet, a moderator directed me to this link:
http://rare-cancer.org/medicine-assistance.html
I applied for assistance with Novartis, the manufacturer of Gleevec. My mom now receives her meds in the mail FREE. Their link is:
http://www.pharma.us.novartis.com/about ... llment.jsp
Click on the box that says "Enrollment Process" for Gleevec and you will get a PDF enrollment form to be filled out by you and your mom's oncologist. Good luck!