Its late this year isn't it? They always used to have it on or around my b-day in mid-january.
As far as i know discount tix for the show are near impossible to get(at least they used to be) unless you work for or know an exhibitor at the show. Your best bet for getting a discount would be to pick up an Inquirer or Daily News and look for the coupons. They usually have some that are good for a few dollars off tix price. Good luck.