This is my first suggestion, so im happy to be shredded

There isnt a lot of proof for the low end, so I stayed conservative.

Feel free to suggest improvements / ask me to resuggest, im open to being wrong

I trawled though every trade on outpost, found no unsolds.

Anyway, proof

Unsolds:

0.66

http://www.tf2outpost.com/trade/21332968 (1 day, poorly bumped)

http://www.tf2outpost.com/trade/21332968 (1 day, looks badly bumped)

http://www.tf2outpost.com/trade/21231945 ( 5 days, looks poorly bumbed)

http://www.tf2outpost.com/trade/21188674 ( 1 week, never bumbed)

0.77:

http://www.tf2outpost.com/trade/21353658 (young)

http://www.tf2outpost.com/trade/21293351 (2 days)

http://www.tf2outpost.com/trade/21169873 ( week, asking for 20% under backpack.tf price which is closest to 0.77)

1 ref

http://www.tf2outpost.com/trade/21360739 (young)

http://www.tf2outpost.com/trade/21366642 (young)

http://www.tf2outpost.com/trade/21328920 ( 1 day)

http://www.tf2outpost.com/trade/21339367 ( 1 day, asking for backpack.tf price)

http://www.tf2outpost.com/trade/21336676 (1 day)

http://www.tf2outpost.com/trade/21306947 (2 days)

http://www.tf2outpost.com/trade/21310106 (2 days)

http://www.tf2outpost.com/trade/21245786 (4 days, asking for low end backpack.tf price)

http://www.tf2outpost.com/trade/21261510 (4 days)

http://www.tf2outpost.com/trade/21238808 (5 days)

http://www.tf2outpost.com/trade/21120554 (1 week)

http://www.tf2outpost.com/trade/21137261 (1 week)

http://www.tf2outpost.com/trade/21058648 (1 week, asking for backpack.tf price)

http://www.tf2outpost.com/trade/20965888 (2 weeks)

http://www.tf2outpost.com/trade/20840367 (2 weeks)

http://www.tf2outpost.com/trade/20949701 (2 weeks)

http://www.tf2outpost.com/trade/20887839 (2 weeks)

1.11

http://www.tf2outpost.com/trade/21170301 ( 1 week)

Classified listings (at time of writing)

1x 0.77 (been there for 6 days)

1x 0.88

27x 1 ref, ranging from new to 6 days old.

From this, it seems 1 ref doesnt sell

<edit> added a few trades at the lower range that were not bumped very well, people asked for more proof for lower end, not sure if they count though