Sodium's name comes from the word soda. I'm not joking, slang attributed to naming one of the most abundant elements on earth (Right behind Si, O, Al, Fe, Mg and Ca)

Sale 1

http://www.tf2outpost.com/trade/27203274 Sold for 13 keys

X = 13

Keys could not be found, but were possibly used to buy C9 Goggles http://backpack.tf/item/4020832948 for 14, as one other key was added with those for the Goggles as shown here http://backpack.tf/profiles/76561198111083553?time=1444978800&compare=1444892400 http://www.tf2outpost.com/trade/27246983

Jeep http://backpack.tf/item/1571216316

Sale 2

http://www.tf2outpost.com/trade/27341200 Sold for MN Broadband

B/O for Jeep was 12

Broadband had a B/O of 14 and was looking for a Soldier Hat

X = 13

X = 12 (B/O)

Broad http://backpack.tf/item/3260650430

Jeep http://backpack.tf/item/3638876891

Trade http://backpack.tf/profiles/76561198123943338?time=1447660800&compare=1447747200

Mini for Broadband

http://backpack.tf/vote/id/5689b5b0dea9e9576d0dd40d 13 keys, using 13

Sale 3

http://www.tf2outpost.com/trade/27235129 Sold for MN Cage

Cage had no trade

X = 14

Cage http://backpack.tf/item/4049644346

Jeep http://backpack.tf/item/743514200

Trade http://backpack.tf/profiles/76561198120885088?time=1447747200&compare=1448524800