People are selling for a large range of prices.

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OUTPOST

9 keys 8 ref -

http://www.tf2outpost.com/trade/26337689

9 keys 9 ref -

http://www.tf2outpost.com/trade/26418052

10 keys -

http://www.tf2outpost.com/trade/26421509

http://www.tf2outpost.com/trade/26397564

http://www.tf2outpost.com/trade/26393618 (spec kill-streak)

http://www.tf2outpost.com/trade/26425124

http://www.tf2outpost.com/trade/26410053

http://www.tf2outpost.com/trade/26413811

11 keys -

http://www.tf2outpost.com/trade/26346537

http://www.tf2outpost.com/trade/26356182

http://www.tf2outpost.com/trade/26386345

I also managed to buy myself one for 9 keys -

http://imgur.com/k48JNDA

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CLASSIFIEDS

1x 9.45 keys

1x 9.51 keys

1x 9.56 keys

6x 10 keys (2x kill-streak, 1x specialized kill-streak)

1x 10.28 keys

2x 10.56 keys (1x specialized kill-streak)

1x 11 keys

1x 11.28 keys (specialized kill-streak)

After That, they are professional kill-streak or too highly priced.

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STEAM COMMUNITY MARKET

(not important, i know, but i decided to add it anyway)

http://imgur.com/XtnN9GR

Strange Australium Frontier Justice - £15.60

£15.60/£1.69 = ~9.23 keys

Strange Killstreak Frontier Justice - £17.04

£17.04/£1.69 = ~10.08 keys

Strange Specialised Killstreak Frontier Justice - £16.45

£16.45/£1.69 = ~9.73 keys

Strange Professional Killstreak Frontier Justice - £22.43

£22.43/£1.69 = ~13.27 keys

I haven't done many of these before, and have only had one accepted, so if there's anything else i need to add, please tell me :)