Reddit mentions of Final Fantasy XI: Seekers of Adoulin [Download]

The last "ultimate collection" was Seekers of Adoulin, and was only available as a physical copy for XB360 for $200 USD.

I've searched for as many of the game boxes as I could on Amazon, you might find them at your local game store. Hope this helps get you started.

PS2
-

• Original Game Bundle + Rise of the Zilart Expansion $35-$80 USD
  
• Chains of Promathia $11-20 USD
  
• Treasures of Aht Urhgan $5-30 USD
  
• Wings of the Goddess $5-$30 USD
  
• Seekers of Adoulin available in JP only, last expansion on physical media for PS2
  
• The Vana'diel Collection 2008 $15-$100 USD
  
  XB360
  -
  
• Game + first 3 expansions $5-65 USD
  
• Wings of the Goddess $5-$20 USD
  
• Seekers of Adoulin $15-$20 USD
  
• The Vana'diel Collection 2008 $15-$100 USD
  
• The Ultimate Collection (2009) $85-$150 USD
  
  PC
  -
  
• Game + Rise of the Zilart Expansion $10-$50 USD
  
• Chains of Promathia $5-$20 USD
  
• Treasures of Aht Urhgan $5-$20 USD
  
• Wings of the Goddess $10-$20 USD
  
• Seekers of Adoulin (digital download only) $20-$40 USD
  
• The Vana'diel Collection 2005 $7-$20 USD
  
• The Vana'diel Collection 2007 $10-$20 USD
  
• The Vana'diel Collection 2008 $15-$100 USD
  
• The Ultimate Collection (2009) $85-$100 USD, this is the last physical collection for PC
  
• Ultimate Collection Seekers Edition (digital download only) $29-39 USD
  
  EDITS: formatting

http://www.amazon.com/gp/product/B00AWEMODK/ref=s9_simh_gw_p367_d19_i1?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-2&pf_rd_r=0MPH6R0DHE2ZE97N5TBA&pf_rd_t=101&pf_rd_p=1688200382&pf_rd_i=507846

Same price, full collection.

http://www.amazon.com/gp/product/B00AZNBP1A/ref=s9_simh_gw_p367_d19_i2?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-2&pf_rd_r=0MPH6R0DHE2ZE97N5TBA&pf_rd_t=101&pf_rd_p=1688200382&pf_rd_i=507846

Just the expansion for $10 less.

http://www.amazon.com/Final-Fantasy-XI-Seekers-Download/dp/B00AZNBP1A/ref=sr_1_6?s=videogames-download&ie=UTF8&qid=1381393161&sr=1-6

Here's an amazon download for just seekers $19.99, haven't personally used amazon but should be fine I'd imagine.