Mana costs for healing champs:
Alistar- Triumphant Roar RANGE: 575 COST: 40 / 50 / 60 / 70 / 80 Mana
Self Heal: 60 / 90 / 120 / 150 / 180 (+ 20% AP)
Ally Heal: 30 / 45 / 60 / 75 / 90 (+10% AP)
Bard- Caretaker's Shrine RANGE: 1000 COST: 100 / 105 / 110 / 115 / 120 Mana
Minimum Heal: 30 / 60 / 90 / 120 / 150 (+ 20% AP)
Maximum Heal: 70 / 110 / 150 / 190 / 230 (+ 45% AP)
Champs stepping over it gains 50% bonus movement speed which decays over 1.5 seconds
Kayle- Divine Blessing RANGE: 900 COST: 60 / 70 / 80 / 90 / 100 Mana
Heal: 60 / 105 / 150 / 195 / 240 (+ 45% AP)
Movement Speed: 18 / 21 / 24 / 27 / 30% (+ 7% per 100 AP)
Nami- Ebb and Flow RANGE: 725 COST: 70 / 85 / 100 / 115 / 130 mana
Heal: 65 / 95 / 125 / 155 / 185 (+ 30% AP)
Magic Damage: 70 / 110 / 150 / 190 / 230 (+ 50% AP)
Nidalee- Primal Surge RANGE: 600 COST: 60 / 75 / 90 / 105 / 120 Mana
Heal: 45 / 85 / 125 / 165 / 205 (+ 50% AP)
Attack Speed: 20 / 30 / 40 / 50 / 60%
Sona- Aria of Perseverance RANGE: 1000 COST: 80 / 85 / 90 / 95 / 100 Mana
Heal: 30 / 50 / 70 / 90 / 110 (+ 20% AP)
Max. Heal: 45 / 75 / 105 / 135 / 165 (+ 30% AP)
Shield Strength: 35 / 55 / 75 / 95 / 115 (+ 20% AP) (+ 10 / 20 / 40)
Soraka- Astral Infusion RANGE: 550 COST: 10% Maximum Health + 20 / 25 / 30 / 35 / 40 Mana
Heal: 120 / 150 / 180 / 210 / 240 (+ 60% AP)
Taric- Imbue RANGE: 750 COST: 60 / 80 / 100 / 120 / 140 mana
Heal: 60 / 100 / 140 / 180 / 220 (+ 30% AP) (+ 5% bonus health)
If Taric heals only himself, the heal will be 40% more effective.
Self Heal: 84 / 140 / 196 / 252 / 308 (+ 42% AP) (+ 7% bonus health)
I'm sorry, but what were you saying about Bard's heal costing too much?