Use desktop site, the price on the mobile site is more expensive today.
Lii-500 sold out. They added more stock this morning after selling out, so may be worthwhile checking again later.
Pretty sure cheapest price yet for the Lii-500, even cheaper with cashback.
Lii-202 US $4.14 (~AU $6.50) Back in Stock
Lii-402 US $5.17 (~AU $8.94) Back in Stock
Lii-500 US $11.37 (~AU $17.86) Sold Out
Lii-500s US $16.05 (~AU $25.79) Back in Stock
Prices inclusive of GST