Of course the prices are available, for every car model. It's not US healthcare :D
There's also long-term battery health data available now from Teslas and Leaf. Tesla batteries degrade 1%-2% per year on average.
Here are UK battery prices (this is the priciest component of an EV, the upside is that motors and transmission may last car's lifetime):
Audi e-tron - £6,194.40 (71.2)
Audi e-tron GT - £8,125.80 (93.4)
Audi e-tron Sportback - £6,177 (71)
Audi Q4 e-tron - £4,524 (55)
BMW i3 - £3,297.30 (37.9)
BMW i4 - £7,020.90 (80.7)
BMW iX3 - £6,423.21 (73.83)
BMW iX - £6,177 (71)
Citroën ë-Berlingo - £4,350 (50)
Citroën ë-C4 - £4,350 (50)
Citroën ë-Spacetourer - £4,350 (50)
Cupra e-Born - £5,394 (62)
DS 3 Crossback E-Tense - £4,350 (50)
Fiat 500e - £2,088 (24)
Ford Mustang Mach-E - £6,585.90 (75.7)
Honda e - £3,088.50 (35.5)
Hyundai Ioniq 5 - £5,063.40 (58.2)
Hyundai Ioniq Electric - £3,332.10 (38.3)
Hyundai Kona Electric - £3,410.40 (39.2)
Jaguar I-Pace - £7,830 (90)
Kia EV6 - £6,733.80 (77.4)
Kia e-Niro - £5,568 (64)
Kia Soul EV - £5,568 (64)
Lexus UX300e - £4,724.10 (54.3)
Mazda MX-30 - £3,088.50 (35.5)
Mercedes-Benz EQA - £5,785.50 (66.5)
Mercedes-Benz EQB - £5,785.50 (66.5)
Mercedes-Benz EQC - £6,960 (80)
Mercedes-Benz EQE - £7,830 (90)
Mercedes-Benz EQS - £9,378.60 (107.8)
Mercedes-Benz EQV - £8,700 (100 kWh)
MG5 EV - £5,315.70 (61.1 kWh)
MG ZS EV - £4,445.70 (51.1)
MINI Electric - £2,836.20 (32.6)
Nissan E-NV200 COMBI - £3,480 (40)
Nissan Leaf - £3,393 (39)
Peugeot e-208 - £4,350 (50)
Peugeot e-2008 - £4,350 (50)
Peugeot e-Rifter - £4,350 (50)
Peugeot e-Traveller - £4,350 (50)
Polestar 2 - £6,003 (69)
Porsche Taycan - £6,890.40 (79.2)
Renault Zoe - £4,524 (52)
Škoda ENYAQ iV - £6,699 (77)
Škoda ENYAQ Coupe - £6,699 (77)
Smart fortwo EQ - £1,531.20 (17.6)
Tesla Model 3 - £5,420.10 (62.3)
Tesla Model S - £8,700 (100)
Tesla Model X - £8,700 (100)
Tesla Model Y - £6,525 (75)
Vauxhall Combo-e Life - £4,350 (50)
Vauxhall Corsa-e - £4,350 (50)
Vauxhall Mokka-e - £4,350 (50)
Vauxhall Vivaro-e Life - £4,350 (50)
Volkswagen ID.3 - £5,046 (58)
Volkswagen ID.4 - £4,524 (52)
Volkswagen ID.5 - £6,699 (77)
Volvo C40 Recharge - £6,787 (78)
Volvo XC40 Recharge - £6,787 (78)
There's also long-term battery health data available now from Teslas and Leaf. Tesla batteries degrade 1%-2% per year on average.
Here are UK battery prices (this is the priciest component of an EV, the upside is that motors and transmission may last car's lifetime):