Good lord there's a lot of these things on outpost. Lowest buyout is 3, but as always buyouts mean little.

http://www.tf2outpost.com/trade/4695228- He claims offers of 2-2.33 buds, though it's not in the trade.

http://www.tf2outpost.com/trade/4857627- This fellow copy and pasted the other guy's offers. I'd say alt account, but they're different blokes...?

http://www.tf2outpost.com/trade/4057521- Went back far enough to finally find the 2.33 bud offer. It was a month ago.

http://www.tf2outpost.com/trade/4595650- This one had an offer of a Max Head. Seller was willing to go down to a little under 2.5.

A slightly higher high point could be argued given there was a legitimate 2.33 offer, though the fact it hasn't been seen again and it tends to max out at 2 is definitely notable.