My best buys for sensory and fidget toys are usually in the $2 shops – but for more specific items, here are some more (mostly) Australian shops.
Here is a good list of fidget toys.
Australian Geographic – lots of interesting little bits’n’bobs. Browsing the stores are better than navigating their website (no “sensory” category).
Autism Advisory and Support shop (NSW, shipping $12).
Educational Experience (NSW, shipping $14.20+). No specific “Sensory” category, but a search returns many sensory products.
Foss education (NSW, shipping $12.50).
Indigo Toys (Qld, shipping calculated at checkout).
iQtoys (Qld, shipping $7.99).
Modern Teaching Aids (NSW, shipping $12.90 – though orders can be phoned through and picked up at the Brisbane outlet store). No specific “Sensory” category, but a search returns many sensory products.
My Diffability (Vic, shipping $8.25+).
One Stop Sensory Shop (NSW, shipping calculated at checkout).
Psylutions for Learning (Qld, shipping calculated at checkout).
Resources at hand (Qld, shipping calculated at checkout).
Senseabilities (Vic, shipping $8+).
SensoryTools (NSW, shipping calculated at checkout).
Sensory Wonders (Vic, shipping calculated at checkout).
Skillbuilders (WA, shipping $8.25+).
Special needs 4 special needs (Qld, shipping calculated at checkout).
Special Needs Toys (NSW, shippingcalculated at checkout).
Sue Larkey’s Online Shop (NSW, shipping $12.50+).
Therapy Toy Shop (Vic, shipping $12+).
The Teaching Toy Box (Ebay store) – my only non-Australian source! Seller will provide combined shipping on request, which makes it more affordable.
The Toy Bug (Qld, shipping $12.90).
Windmill (Vic/SA/Tas, shipping $10+).
And if you prefer to try before you buy – check out Noah’s Ark Toy Library (Brisbane). Membership fees can be paid using FaHCSIA funding.