My son, Alexander has a global developmental delay, which basically means that he is developing a bit slower than his peers, but for Alexander, it also means that his interests are VERY specific. For the last couple of years, all he wants to play with is anything related to Super Mario, World of Warcraft, Star Wars and Donkey Kong. This doesn't mean he spends a lot of time in front of a computer or TV, but rather that he spends a LOT of time playing and recreating things from these games. If I were to purchase the amount of "bad guys" and "good guys" from these games for him to play with, I would be in a huge amount of debt. My answer for this has been that we turn his favorite games into sets of "Flat Guys". I scour the internet for pictures of his favorite video game heroes and villains, gather them in 1 page documents, and print them on
iron-on paper transfers. After they are printed out, I iron the pages on to $0.50 sheets of white felt, then cut them out. That's it. It's basically a mix between a boy version of felt paper dolls, and the old felt boards I used to see in Sunday School. He uses the items and creatures to create levels or areas from his games (he loves this the most), then uses a felt Mario or whatever, and completes the levels. He even hums the right theme music and makes the sounds as he plays. It's all pretty fantastic, and because they weigh basically nothing, it is a toy that always comes to the hospital when needed, or when we go anywhere.
If your child isn't as amazed by Mario, Donkey Kong and Warcraft guys, I am sure the same thing could be done with My Little Pony or whatever else he or she might be interested in.
For those of you with special needs kiddos, I've also used these kinds of printed felt cut-outs for social story like activities. We've had food "flat guys", to learn what a meal vs snack is on a felt plate, and felt weather items (Sun, clouds, numbers, lightning, rain clouds etc) to talk about weather, and appropriate things to wear.
As long as you have about $20 in Canada, or $15 in the US (most of that would be spent on the iron on sheets, because felt is cheap), an iron, a printer, and a pair of scissors, your imagination is the only limit :)
Feel free to download the sets
here (Mario, Angry Birds, Warcraft, Donkey Kong), so your can make your own