I remember seeing "scent" sticks that were like the vicks vapor inhalers here -

[rafiki]

.

[Jennifer-72]

We have this type of diffuser for the school room. I use vetiver or cedearwood for scent. I just bought them at our health foods store.

[Barbara H]

Was it this? http://store.fhautism.com/p-291-bthe-gentle-gecko-a-weighted-sensory-toyb.aspx

 

With scents I would suggest getting natural oils from a health foods store. Citrus scents are good for a lot of people. At all costs avoid the scented products sold at the grocery store as they can be really hard for people with any kind of allergies or sensitivities.