Yeeeee... 1º Suggestion!

Proof:

http://www.tf2outpost.com/trade/24466448 (1.5 keys)

http://www.tf2outpost.com/trade/24408648 (2 keys - Negotiable)

http://www.tf2outpost.com/trade/24423482 (2 keys)

http://www.tf2outpost.com/trade/24433631 "

http://www.tf2outpost.com/trade/24457747 "

http://www.tf2outpost.com/trade/24407521 "

http://www.tf2outpost.com/trade/24463457 "

http://www.tf2outpost.com/trade/24409146 "

http://www.tf2outpost.com/trade/24332958 "

http://www.tf2outpost.com/trade/24261366 "

http://www.tf2outpost.com/trade/24453505 "

http://www.tf2outpost.com/trade/24387271 (2 keys + 9 refs)

http://www.tf2outpost.com/trade/24426500 (3 keys)

http://www.tf2outpost.com/trade/24368279 "

http://www.tf2outpost.com/trade/24466851 "

http://www.tf2outpost.com/trade/24433553 (3 keys + 5 refs)

http://www.tf2outpost.com/trade/24420462 (3.5 keys)

http://www.tf2outpost.com/trade/24406336 (3.5 keys)

http://www.tf2outpost.com/trade/24396744 (3 keys + Gift wrap)

http://www.tf2outpost.com/trade/24400749 (3.5 keys + Burning Players Kills)

http://www.tf2outpost.com/trade/24466391 (3.5 keys + Spec Ks)

http://www.tf2outpost.com/trade/24460622 (5 keys)

http://www.tf2outpost.com/trade/24455952 "

http://www.tf2outpost.com/trade/24413568 (5 keys + Basic Ks)

http://www.tf2outpost.com/trade/24378554 (6 keys)

http://www.tf2outpost.com/trade/24446533 "

http://www.tf2outpost.com/trade/24328556 (10 keys)

http://www.tf2outpost.com/trade/24357623 (12 keys)

http://www.tf2outpost.com/trade/24377954 (S. F. Shotgun)

http://www.tf2outpost.com/trade/24465098 (S. F. Revolver)

http://www.tf2outpost.com/trade/24367479 (Offers - Declined 6 keys)

http://www.tf2outpost.com/trade/24419815 (12 ref)

http://www.tf2outpost.com/trade/24457000 (2 ToD tickets)

http://www.tf2outpost.com/trade/24453491 (1 key)

http://www.tf2outpost.com/trade/24376565 "

http://www.tf2outpost.com/trade/24441560 "

http://www.tf2outpost.com/trade/24433978 "

http://www.tf2outpost.com/trade/24410416 "

http://www.tf2outpost.com/trade/24376879 "

http://www.tf2outpost.com/trade/24432585 (1 key + 3 refs)

http://www.tf2outpost.com/trade/24403703 (20 ref)

http://www.tf2outpost.com/trade/24412149 (2 keys)

http://www.tf2outpost.com/trade/24425478 (2 Naughty keys)

http://www.tf2outpost.com/trade/24455726 (S. Cop Caller)

http://www.tf2outpost.com/trade/24365954 (50% of Steam Market)

http://www.tf2outpost.com/trade/24438943 (Scoper's Smoke #98 for 3 New S. Festives)

http://www.tf2outpost.com/trade/24394397 (S. F. Chargin' Targe)

http://www.tf2outpost.com/trade/24430004 "

http://www.tf2outpost.com/trade/24418517 "

http://www.tf2outpost.com/trade/24415875 (S. F. Bonk! Atomic Punch)

http://www.tf2outpost.com/trade/24443084 "

http://www.tf2outpost.com/trade/24389065 (S. F. SMG)

http://www.tf2outpost.com/trade/24427910 (S. F. Bonesaw)

http://backpack.tf/stats/Strange/Festive%20Backburner/Tradable/Craftable

(1.71 - 2 keys)

http://steamcommunity.com/market/listings/440/Strange%20Festive%20Backburner ($4.08 USD - $4.95 USD ~2 keys)

^^ Bonus Ducks!