Haven't seen this posted yet. Ships from and sold by Amazon.com:
EDF 4.1 PS4:
http://www.amazon.com/Earth-Defense-Force-4-1-Despair-PlayStation/dp/B00Z9LTDFS
EDF 2 Vita:
http://www.amazon.com/Earth-Defense-Force-Invaders-Planet-PlayStation/dp/B00YMIQTFG
Great series!
Warning: EDF 4.1 on...