what kind of AAC do you use, my son is non speaking and is interested in one, but I have no idea where to start
Kiku uses lots of kinds of AAC!
Mostly Kiku's phone and ipad with multiple apps on them (LAMP, Prolquo2go, Proloquo4text, Touchchat, Proloquo, and TD Snap), communication boards with words and symbols on them, communication books, letterboards, picture cards, communication cards, emojis, texting and gestures and noises (think that is everything).
A good place to start is to see if you have or could get a tablet to use for AAC or some other form of robust AAC (robust means the user can say anything they want to with it. Robust AAC has all parts of speech, punctuation, a keyboard, and prestored messages.)
Most robust AAC apps are on apple but there are some on android as well.
PODD books are an example of a robust communication book.
Also keep in mind that many AAC users communicate in many ways (multimodal communication) and whatever you start with likely won't be the only way he communicates. Finding what works for a user takes time.
If your son has any other disabilities those should be taken into consideration (visual impairment, motor skill issues, ect) but also know that kids can often adapt pretty well and things like a smaller grid size or hiding a bunch of buttons should be a last resort if the user shows they need it. (Kiku uses multiple grid sizes).
If there aren't any real concerns about vision or motor skills then it's best to go with the largest grid size the user can see and touch.
AAC apps often go on sale twice a year for AAC awareness month and Autism awareness month).
Some info about some aac apps:
Kiku can only talk about apple based apps because those are what Kiku uses. Some offer trials or another way to access vocabulary to try it.
LAMP Words for life: 1 grid size (84 buttons/ 7 by 12 grid). $300 US Lamp is a heavily motor planning based aac app with a associate based organization method. LAMP was designed with autistic people in mind and can be helpful for those with motor disabilities or motor planning disabilities (apraxia). It has a small amount of high contrast symbols. LAMP is unique because it has only one spot for each word and it alerts you if you accidentally try to add a word again. That is because of the method behind LAMP (language accusition through motor planning). Bilingual options
Proloquo2go: multiple grid sizes, including custom grid sizes. $250 US Proloquo2go is a highly customizable aac app. A highly recommend grid size is 7 by 11. Custom grid sizes have to be organized by the user/person setting up the aac device for the user. Of of the more unique features of Proloquo2go is it has a typing feature. It lets you use the system keyboard to type in a large space. You can have it speak or show it to someone. Bilingual options
Touchchat: multiple grid sizes. $300 for Touchchat with Wordpower, a couple other options available. fairly customizable, multiple premade vocabularies. Options to buy multiple symbol sets. Editing is a bit more involved than with some other apps. Wordpower is the best option if going with Touchchat because they are the most robust vocabulary options. Option of high contrast symbols. Bilingual options.
Proloquo: 1 grid size (roughly 6 by 10). Subscription based, 3 options: $9.99 monthly, $99.99 yearly, or 1 to 5 year licenses. Comes with Proloquo Coach which helps parents learn about aac and how to teach aac. Proloquo has so many words. And a lot of room to add more. Might not be the best option for users with visual or motor impairments, but every user is different. Kiku highly recommends Proloquo because so many preprogramed words, with a good grid size, and access to Proloquo Coach.
TD Snap: multiple grid sizes. Subscription based: $9.99 a month. Multiple premade pagesets of varying sizes. Multiple vocabulary options. (Core first, Motor Plan, Aphasia, PODD ($4.99 a month), and Gateway ($4.99 a month). Large amount of high contrast symbols. TD Snap used to be a $50 one time purchase. But it recently became subscription based.
Proloquo4text: Text based with presaved phrases. Fairly customizable.
Speak for Yourself (S4Y): 1 grid size (120 buttons/8 by 15 grid) $300 US. another heavily motor planning based aac app, this one with no word more than 2 taps away. Words can only be added once, similar to LAMP. Unique features include babble (the ability to toggle between having a certian number of buttons showing or all of them), hold that thought (stores messages so you can say something else and then return to the previous message), and a history feature (shows you things that have been said using the app).