Homemade flashcards for your little munchkins :)
  U can make your own flashcards at home..  babies at the age of five months and so on are fond of colors..  primary colors..

1) U can bring A4 size papers cut them into two and laminate the same.  show it to ur baby introducing one color each.

2)Even u can stick pitcures of ur family members on white papers cut them into the size of photos and laminate them.  introduce them to baby..  say for n example.. (say hie to nani,  say hie to masi).. 

3)moreover u can introduce shapes later on..  cutting paper of different shapes.. stick ice cream stick behind it n show to ur baby that this is circle..  this is triangle..

All above is with minimal cost.  hope this is helpfull :)