Long time lurker and beneficiary of deals but first post so have my "L-plates" on. Saw this on Price Hipster and it looks like a very recent introduction.
The combo pack includes the cordless blower and line trimmer with a 4 amp battery. The separates (with a better blower - 245kmh vs 190kmh - AND a 5 amp battery) come in at $308. With the smaller battery and an inferior blower that is an $80 difference. Not suggesting it is a fantastic deal but if you don't need the faster blower, it's not bad… especially as Bunnings just put the price of the two 5 amp battery pack up by $30.
The single trimmer (console only) is $109 https://www.bunnings.com.au/ryobi-one-18v-305mm-cut-cordless.... I can't find that blower on its own, so hard to gauge the exact saving.