How about a PS1 handheld? Now you probably won't be finding it at Walgreens and definitely not for $20, but hey - whatever.
http://www.superufo.com/product_html/Cool_Stuff_PS_One_Handheld_Game_Player___Black.html
In this case, I would probably say you're better off finding an older PSP. Then you'd have all your old systems portable anyway
http://www.superufo.com/product_html/Cool_Stuff_PS_One_Handheld_Game_Player___Black.html
In this case, I would probably say you're better off finding an older PSP. Then you'd have all your old systems portable anyway
