Some VPNs have really good deals on VPNs

Purevpnhave altered their price to $1.15 from $9.95 for their 5 year plan
Nordvpnare giving 77% off at $2.75/month on their 3 years plan
Ipvanishis giving 25% off on thier yearly plan at $4.85/month

Which one has better service? I am thinking of getting one of them