Now that some times pasted I'm going to try this suggestion again. Getting 1.5 keys for this overlooked festive is extremely rare, if not impossible.

Sellers at 1.2 keys or below:

http://backpack.tf/classifieds/search/659/6/0

http://www.tf2outpost.com/trade/12624182 my trade :P

http://www.tf2outpost.com/trade/12752200 1 key

http://www.tf2outpost.com/trade/9674653

http://www.tf2outpost.com/trade/12717279

http://www.tf2outpost.com/trade/11021819

http://www.tf2outpost.com/trade/12559914

http://www.tf2outpost.com/trade/12666573

http://www.tf2outpost.com/trade/12670938 1 key

http://www.tf2outpost.com/trade/12693500

http://www.tf2outpost.com/trade/12721388

http://www.tf2outpost.com/trade/12762816

Unsold at 1.5 keys:

http://www.tf2outpost.com/trade/12464346 8 ref = 1 key (5.66) + 2.33 (around) 1 week

http://www.tf2outpost.com/trade/12692644 2 days

http://www.tf2outpost.com/trade/12557759 5 days

http://www.tf2outpost.com/trade/12625091 3 days

http://www.tf2outpost.com/trade/12465217 1 week

http://www.tf2outpost.com/trade/12204361 2 weeks

http://www.tf2outpost.com/trade/12241269 2 weeks

http://www.tf2outpost.com/trade/12649332 3 days

http://www.tf2outpost.com/trade/12654015 3 days

http://www.tf2outpost.com/trade/12584798 key + 2 ref, 4 days

http://www.tf2outpost.com/trade/12612509 4 days

http://www.tf2outpost.com/trade/12686908 2 days

http://www.tf2outpost.com/trade/12661923 3 days, guy in offers was taking about the other flamethrower

Gathering proof is a pain with so many people ether selling in a set or asking for 2 keys.