All prices on lazaruslabs.com.au include GST. The price you see on a product page is the price you pay at checkout.
Google Shopping and some ad listings can display the ex-GST feed price, which makes a product look roughly 10% cheaper in the Google listing than on the website. That difference isn't a discount being removed or a price increase at checkout — it's the same product with GST shown at different stages.
For example: a product shown at $115 in a Google listing is $126.50 on the website once GST is included. The checkout total always matches the GST-inclusive website price.
If our team quoted you a specific price, or a promotion showed a different amount, reply in your support conversation with a screenshot and we'll check it.