As of Oct 2013: typical cost $0-$65. To verify cost for a patient, verify with the pharmacy they fill prescriptions at as cost varies.
Links to information from the manufacturer:
Apixaban:
http://packageinserts.bms.com/pi/pi_eliquis.pdf
Rivaroxaban:
http://www.xareltohcp.com/sites/default/files/pdf/xarelto_0.pdf#zoom=100
Other information for medication costs:
www.Needymeds.org