Pre-flop I raise 99 from mp. TT/JJ are in villain's range.
I c-bet overpairs on paired boards.
Turn, I don't expect quads here often.
River, ok, I figure bet call is good, hoping for a stupid 22/44. Bet size?

Full Tilt No-Limit Hold'em, $1 BB (8 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($67.85)
UTG+1 ($58.85)
Hero ($91)
MP2 ($83.50)
CO ($20.40)
Button ($119.40)
SB ($116)
BB ($164.90)

Preflop: Hero is MP1 with 9, 9.
2 folds, Hero raises to $3.5, 1 fold, CO calls $3.50, Button calls $3.50, 2 folds.

Flop: ($12) 5, 5, 2 (3 players)
Hero bets $8, CO folds, Button calls $8.

Turn: ($28) 5 (2 players)
Hero bets $17, Button calls $17.

River: ($62) 4 (2 players)
Hero bets ?,