Toys r us has a special needs catalogue that features toys for autistic children. You could place an ad in your local paper for your toy swap. You can advertise and host a toy swap party. It sounds like you have a good idea! My son really likes an electronic toy called bop it...its a Simon says type game...he likes anything that's portable, and lights up or spins....patterns and textures are always good

My 4yr old is into everything (literally!) He loves marble tracks, Zingo, candy land, puzzles, crafts, workbooks (dot-to-dot,mazes), anything cars, nerf basketball, disc shooter (shoots circular foam shapes), story cubes. He also loves cooking and baking. It's a great activity on many levels. At his group speech therapy, he seems to love a game called Hullabaloo.

I'd bet your local speech therapy clinic could help organize a toy exchange too. I recently taught my son "Go Fish". We also have something called "Let's Talk". It's essentially a box of cards with questions or statements that inspire conversation (ie- Talk about the last time you made a gift for someone, What is your favorite food and why?) It's certainly good practice for anyone to know how to start up a conversation.

We just bought Disney "Headbandz"- you look ridiculous but my son gets a kick out of it. You have to ask questions to guess what character is on your headband.
We do "Red Rover" which is great because it's physical to boot. You have to find the appropriate bone and get it back to Rover before time is up.
Clever Castle and Pengoloo have been good ones too.
My husband gets mad that I don't let our son win all the time- but I want him to be able to lose gracefully with a peer.
I get most of my ideas from looking at the SLP's games.
Puzzles are also a favorite. We do alot of activities that are OT based- rice buckets, obstacle courses, lite brite taking turns.

It's been really difficult to get our son interested in toys- specifically anything that requires make believe- they are piled up in the corner unused- cars, trains, action figures. At least his cousin loves the hand me downs.

I also specialize in the Son-Rise Progam. You are the best toy, so anything that you can use to draw attention to yourself would be awesome. Hand puppets, costumes, imagination items such as doctor or tool kits, tea sets. Then any toys that can you can create games with, cardboard blocks, bowling sets, and any toys related to things your child loves!