Looking for these Gameboy Megaman games at a fair price

[Lacan]

I'm looking to buy Mega Man Dr Wily's Revenge for Game Boy, Mega Man II for Gameboy, Megaman V for Gameboy, Mega Man Xtreme for Gameboy Color, and Mega Man Xtreme 2 for Gameboy color.

 

I don't know if I will have enough money to buy all of them at once.