My advice would be to just purchase them ahead of time. That is one of, if not the busiest week of the year. The TKTS line has a line to get into the line. And the last few years, there have been very few shows on the board. The majority of people in line get nothing. Most shows aren't taking any sore of Broadway Box code or anything of the sort. Just my .02 cents for what it's worth.
Take a look at the grosses for that week over the years. Most shows not only don't discount that week, but they raise their average ticket price. I used to always go that week because it was a way to do several two-shows days in a row in one trip, but it just got too expensive because every ticket had to be full price.
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