All from http://www.partsexpress.com

Parts for Theater 4 Pi
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290-418 Eminence Delta 15A $67
290-442 Eminence PSD2002 $62
290-554 Eminence H290 horn $30
290-634 Eminence pxb2-1k6 crossover $32
67 + 62 + 30 + 32 = 191

Separate crossover parts
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019-020 8 ohm 100W non-inductive resistor (R3 - one per speaker) $11.50
027-436 20uF, 250V polypropylene capacitor (C5 - one per speaker) $4.95
004-16 16 ohm, 10W non-inductive resistor (R1 & R2 - eight per speaker) $1.50
027-458 0.47, 400V polypropylene bypass capacitor (C1 - one per speaker) $1.38
11.50 + 5 + (8*1.50) + 1.50 = $30

Total 191 + 30 = 221