Alright here are the cost of feats in items from the DMG and MoF. I've shown my math after, feel free to let me know if I have made a mistake (and I'm sure I have
).
Imp. Unarmed = 1,000gp (Bracers of Striking MoF)
Imp. Disarm 1,000gp (Cloak of Battle MoF) 22600gp - 16000 (+4 arm) - 4.6k (double cost +1 staff) = 2x Feat
Imp. Init = 3,000gp (Bracers of Blinding Strike MoF) 106k- 36k (+6 arm) - 64k (doubled cost Speed weapon) = 2x Imp Init Cost
Combat Ref, Blind-Fight, Mobility, Sunder, Expertise = 3,000gp same as Imp. Init according to DMG intelligent items
Alertness = 4,000gp (Dark Blue Rhom. Ioun Stone DMG)
Snatch Arrow = 4,000gp (Gloves of Snaring DMG)
These take some guess work so I'll give it a shot.
Trample, Ride by Att, Spirited Charge = 1500gp (Horseshoes of the Peerkess Steed ElH) 217k - 4k (double cost +10 comp) - 200k (SR 32) - 4k? (guessed from Boots of Striding and Springing (post errata)) = 2x cost of the 3 feats
Cleave = 5,000gp (Sylvan Scim. DMG, if +1d6(no type dam. is +2 market value))
And these make no sense
Spell Penetration = -8150 gp (Robe of Archmagi DMG) 75k - 50k (SR) - [.7 (alignment restriction) * (50k (double cost arm) - 2k (+1 saves)] = .7 * (2x Feat) -11.4 = 1.4 x feat
Improved Combat Reflexes [Epic] = -560,000gp [Everwhirling Chain ELH] 5220325 - 325 MW Chain - 5780000 [+17 weapon]
I will try to do the rest of ELH and the splat books today.
Edit- Some formatting mistakes.

Imp. Unarmed = 1,000gp (Bracers of Striking MoF)
Imp. Disarm 1,000gp (Cloak of Battle MoF) 22600gp - 16000 (+4 arm) - 4.6k (double cost +1 staff) = 2x Feat
Imp. Init = 3,000gp (Bracers of Blinding Strike MoF) 106k- 36k (+6 arm) - 64k (doubled cost Speed weapon) = 2x Imp Init Cost
Combat Ref, Blind-Fight, Mobility, Sunder, Expertise = 3,000gp same as Imp. Init according to DMG intelligent items
Alertness = 4,000gp (Dark Blue Rhom. Ioun Stone DMG)
Snatch Arrow = 4,000gp (Gloves of Snaring DMG)
These take some guess work so I'll give it a shot.
Trample, Ride by Att, Spirited Charge = 1500gp (Horseshoes of the Peerkess Steed ElH) 217k - 4k (double cost +10 comp) - 200k (SR 32) - 4k? (guessed from Boots of Striding and Springing (post errata)) = 2x cost of the 3 feats
Cleave = 5,000gp (Sylvan Scim. DMG, if +1d6(no type dam. is +2 market value))
And these make no sense
Spell Penetration = -8150 gp (Robe of Archmagi DMG) 75k - 50k (SR) - [.7 (alignment restriction) * (50k (double cost arm) - 2k (+1 saves)] = .7 * (2x Feat) -11.4 = 1.4 x feat
Improved Combat Reflexes [Epic] = -560,000gp [Everwhirling Chain ELH] 5220325 - 325 MW Chain - 5780000 [+17 weapon]
I will try to do the rest of ELH and the splat books today.
Edit- Some formatting mistakes.
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