http://www.tf2outpost.com/trade/8160061

Selling for 2.3 buds, offered 36 keys (which was rejected)

http://www.tf2outpost.com/trade/8239609

Selling for 2 buds or other hats, has various offers of low tier Engi unusuals, nothing above 1.2 buds or so.

http://www.tf2outpost.com/trade/9020095

Selling for a Buds and a S. Sapper, which as of now, is 35 keys. (26.5 + 8.5) (1.3 buds) and has no offers yet.

http://www.tf2outpost.com/trade/8307047

Offered over a buds, but not by much. The 36 key offer comes again, best offer is a Smoking Pencil Pusher

Conclusion: Low end's around 1.1 buds, (based on offers), but high end seems to be 1.4/1.5 buds (In unusual offers). Not much success selling it. Current price is fine.