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For whatever reason, the pre-order price has been slashed from the regular MSRP of $39.95 to $17.99, which is already a great deal. However, by typing in the coupon code SONYFIVE, you'll get an additional five dollars off of the set which means you'll be paying roughly fifty cents per episode. The only real downside here is that Amazon's free shipping doesn't kick in until the twenty-five dollar mark, but I'm sure you can find something else on the site to pick up around twelve bucks.
Again, it's a great show and I really can't imagine anyone picking this up and not getting more than their fair share of laughs from it (especially considering the price), so give it a chance and thank me later.
EDIT
While you're at it, Amazon is currently offering up a free trial to Amazon Prime for students (or anyone with a university e-mail) for an entire year. That means unlimited two-day shipping for free regardless of order size and, if you can't wait two days, an easy upgrade to one-day shipping for $3.99 per item. Thanks to whoever it was that mentioned this in the comment section!