I'm sorry Michael, but 100 keys is not 5 buds :/

http://www.tf2outpost.com/trade/14304628

Buyout: 4.7 buds (4 buds + 15 keys)

http://www.tf2outpost.com/trade/14170907 (guy above)

Was originally selling for 5 buds

http://www.tf2outpost.com/trade/14070476

Unsold for 5 buds (2 weeks)

(Not actually sold, as histories suggest. I think this is duped…)

http://www.tf2outpost.com/trade/13697282

Unsold for 5 buds (1 month)

Lowest price taken would be 4.5 buds

-4 buds

-G Robo Sandvich + 12 keys (4.6 buds)

http://www.tf2outpost.com/trade/13824761

Unsold for 5 buds (3 weeks)

http://www.tf2outpost.com/trade/13882082

Bought one for 4.5 buds

http://www.tf2outpost.com/trade/13757931

Unsold for 5 buds (4 weeks)

(Not actually sold as histories suggest.)

http://backpack.tf/classifieds/search/id/5201f57cba25363c4d000007

Only Puddington is selling one, for 4.7 buds (If using 100 keys as the price. Probably wants 5 buds)

http://www.tf2outpost.com/trade/13566029

And apparently he bought one for 4 buds a month ago

http://www.tf2outpost.com/trade/13605959

(All 4 belonged to him, and only 4 buds was paid)

http://backpack.tf/id/76561198050484900?time=1376463600 (83 keys, assuming one key was spent

I cannot find evidence 5 buds is selling at all. Adjusting the high end to the lower buyouts.