These are pretty scarce on the market, but after all who would want such a restrictive strange part? This 2 month old price needs an update.

Selling or sold under current range

http://www.tf2outpost.com/trade/13125281 7 keys

http://www.tf2outpost.com/trade/12971149 7 keys, might have sold

Unsold at current range

http://www.tf2outpost.com/trade/13046970 8 keys, 2 days old, not bumped lately though.

http://www.tf2outpost.com/trade/12331932 3 weeks, was bumped not more than 2 hours before this post. Had an offer that didn't seem to work out, but wasn't pure.

http://www.tf2outpost.com/trade/9478379 Quickbuyer, selling one for 8 keys, still in stock.

Buyers for less than current range that appear to have had some success

http://www.tf2outpost.com/trade/12079592 -Got offers pretty quick, one at 7 keys one at 6.5 keys

Once again, not a whole slew of trades to go off of, but I think it's clear that a drop is needed and 8 keys flat is no longer tenable.