If you're wondering how I got mine, I got a strangifier and used it. Pretty rare item, not that many solds / sellers.

Classifieds: http://backpack.tf/classifieds/?item=gaiter+guards&quality=11

1x 4 keys

1x 5 keys

Community market: http://steamcommunity.com/market/listings/440/Strange%20Gaiter%20Guards

(4.60 € or 6.15 $ - 15%) / 1.87 € or 2.50 $ = 2 keys 3.55 ref

(Sold for 1 key 7.44 ref to 2 keys 6.66 ref last week)

Selling

http://www.tf2outpost.com/trade/21616626 - 4 keys (1 week)

http://www.tf2outpost.com/trade/20373174 - offers, best: 1 key 7.66 ref mixed at the time (1 month)

http://www.tf2outpost.com/trade/21596941 - offers, best: 2 keys (1 week)

Sold

http://www.tf2outpost.com/trade/20289184 - 2 keys (1.5 months ago)

http://www.tf2outpost.com/trade/19998938 - 2 keys (2.7 months ago)

http://www.tf2outpost.com/trade/19114632 - 2 keys (4 months ago)

buyers (none bought)

http://www.tf2outpost.com/trade/21024134 - 1 key (4 weeks)

http://www.tf2outpost.com/trade/21480035 - "bp.tf" (1 week)

http://www.tf2outpost.com/trade/21681199 - 1 key (4 days)

http://www.tf2outpost.com/trade/20241216 - 1 key (1 month)

http://www.tf2outpost.com/trade/21450459 - 1 key (1 week)

http://www.tf2outpost.com/trade/21552925 - 1 key (1 week)

http://www.tf2outpost.com/trade/21662479 - 1 key (5 days)

http://www.tf2outpost.com/trade/21194534 - 1 key (3 weeks)

http://www.tf2outpost.com/trade/20995997 - 1 key (1 month)

http://www.tf2outpost.com/trade/21283733 - 1 key (2 weeks)

http://www.tf2outpost.com/trade/21347376 - 1 key 1 ref (2 weeks)

Any additional proof / counter-proof / constructive criticism is greatly appreciated