cheap dog collars for x-small dogs can make good restraints if you don't feel like spending upwards of 50-100 bucks for restraints.

also a sleep mask can work as a blindfold

kitchen tongs can be good for grabbing and pulling at flesh.

you can take a condom and fill it with water and then freeze it for an ice dildo. (just be careful how long the skin is exposed to the ice.)

the nose clips you use when going underwater could work well with breath play...

and of course i agree with everything else everyone else has suggested!! all good stuff!

apologies if i've mentioned something that someone else has already posted...i can't remember them all!