How much (on average) would it cost to have a ptosis repair and an upper blepharoplasty?

You've asked a reasonable question but its difficult to give a precise answer.  First of all I have no idea without photos of you and an in-person consultation whether at your age you would be a candidate for either ptosis repair or blepharoplasty. That being said, I commend you for not searching for a "cheap repair." Make sure to choose a board-certified, fellowship-trained Oculofacial Plastic Surgeon with specific expertise in cosmetic blepharoplasty and ptosis surgery -- do not choose a doctor who does eyelid surgery part-time.  Given what i've already said, $5000-$6000 is a reasonable budget for your surgery, but that depends on what you and your surgeon decide. 
Damon B. Chandler, MD
Harvard-Penn Trained Oculofacial Plastic Surgeon

Thanks for your question.  You can definitely combine a ptosis repair with an upper blepharoplasty.  Depending on where you live, the price can vary between $2500-5000.  It also depends on you and your surgeon and whether you will have sedation vs only local anesthesia.  
Best of luck on your search!