Bitmain just updated their pricing with the reconfigured S7-LN PSU included.

https://enshop.bitmain.com/productDetail.htm?pid=00020160527114935137wr0xd6U006A9

You can't line these things up side by side for comparison because the LN is only 2 hash boards.  You can easily work out the $/TH and scale it up to 4.66 for comparison though.

If you do that 4.66 TH with PSU is valued from Bitmain at $480.  Using the same ratio of unit and PSU cost you get the following.
New:
S7 = $366
PS = $114

Now considering PSUs are basically worthless used... You can buy a used 1200W hp for $30 on eBay.  Not an auction either, full time eBay store with 100s available.  Now consider eBay is naturally overpriced and $30 for PSU with VGA cables sounds reasonable.
http://www.ebay.com/itm/HP-DL580G5-437572-B21-441830-001-438202-002-800-1200W-AC-Power-Supply-/161940249325?hash=item25b4641aed:g:ZZUAAOSwwPhWjt1t

Used:
S7: $295
PS: $30

I was expecting $325/bundle ($300 if purchasing all of them).  Suddenly $295 (with brand new at $366) doesn't sound nearly as crazy.

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This is looking at real low ball performance out of the LN model too.  It appears to be 2 of the 45 chip hash boards.  Clocked at 700M I would expect to see 2/3 of batch 17 performance, or 3.15TH/s.  Using those numbers scaled to 4.66TH/s you only get a total value from Bitmain of $415 with PSU, not $480.  The above was all done assuming the low rated performance of 2.7TH/s (as opposed to expected 3.15TH/s) as that's how it's currently listed.

If it turns out the LN performs at 3.15TH/s and you scale to 4.66TH/s you get:
New:
S7 = $315
PS = $100

Now my proposed fair pricing looks like a steal for the seller.  Offloading for $20 less than manufacturer...
Used:
S7: $295
PS: $30