Amazon AU is having another sale on selected Philips LED (https://www.amazon.com.au/apb/page/ref=gbps_tit_s-6_a969_df4…). There are more listed on the page than the ones below, but can still be bought cheaper (per unit cost) from Woolworths (albeit in 2-packs, https://www.woolworths.com.au/shop/search/products?searchTer…). General rule of thumb, if the unit price for the bulb is $6.50 or less, then it'll pretty much be the cheapest.
EDIT 08/06/19: Some items back in stock at the discounted price.
High colour rendering (CRI> 80) for vibrant colours
E27 Edison Screw
18.0W A67 - Cool White - 2000Lm (A discontinued model, same as this one: https://www.woolworths.com.au/shop/productdetails/572060/phi…. The newer model outputs 2300Lm at 19W, but sells for $21 each, https://www.bunnings.com.au/philips-19w-2300lm-cool-daylight… )
https://www.amazon.com.au/dp/B011ANT87G?&smid=ANEGB3WVEVKZB
$6.90EXPIRED(Currently shown as out of stock, but it was shown before as "More coming" by Amazon)
13.0W A60 - Warm White - 1400Lm
https://www.amazon.com.au/dp/B077K3R2XX?smid=ANEGB3WVEVKZB
$3.90back to higher price10.5W A60 - Warm White - 1055Lm
https://www.amazon.com.au/dp/B077K673B6?&smid=ANEGB3WVEVKZB
$5.50
10.5W A60 - Cool White - 1055Lm
https://www.amazon.com.au/dp/B077K87C7M?&smid=ANEGB3WVEVKZB
$5.50EXPIRED8.5W Soft White Dimmable - 806Lm
https://www.amazon.com.au/dp/B077K3JVP6?&smid=ANEGB3WVEVKZB
$4.90EXPIREDBack
(Or get this one price beat at Bunnings, which sells for $12.60 each, https://www.bunnings.com.au/philips-8-5w-806lm-warm-white-es…)
8.0W A60 - Warm White - 806Lm
https://www.amazon.com.au/dp/B077K1TGZX?&smid=ANEGB3WVEVKZB
$4.90EXPIRED
B22 Bayonet Cap
18.0W A67 - Cool White - 2000Lm
https://www.amazon.com.au/dp/B011ANTGDM?&smid=ANEGB3WVEVKZB
$6.90EXPIRED10.5W A60 - Cool White - 1055Lm
https://www.amazon.com.au/dp/B077K3QDFX?&smid=ANEGB3WVEVKZB
$4.90back to higher priceAvailable again8.0W A60 - Warm White - 806Lm
https://www.amazon.com.au/dp/B077K87C7L?&smid=ANEGB3WVEVKZB
$4.90EXPIREDBack
I'm guessing these are the "older" models that Amazon is trying to clear. Although some are more "efficient" (higher Lm/W) compared to the newer versions (which now generally sells for $15 or $13, depending on output, for a 2-pack at Woolworths, https://www.woolworths.com.au/shop/productdetails/871609/phi…).
Thanks OP. Ordered 3.