Here's where I get to sound OLD. When I was in primary school these were the MUST HAVE item of the school yard. Needless to say I never did have one. =(
Which probably explains why I have amassed up a collection such as this now to make up for that. I would borrow these at the time more than the person owned them! LOL
The majority of these have been purchased on eBay (much to my wife's complaints) with the exception of Donkey Kong which my mum purchased at a swap shop. It was broken when I got it but I managed to pry it open and get it working again! Also Super Mario Bros was a gift from a friend and it's in the best condition of the lot!