There are sources to purchase these less than retail.
The more compelling issue afaic’d is previous experience and preference for specific airbag technology. If you’re previous experience with Dainese is poor, maybe trying another brand is a good idea. Also, each airbag has pros and cons - you might prefer Astar or another vs Dainese. I think Vircos previously was compatible with Astar, but I don’t know about Rev’It.
I have the high end RS Taichi with the Astar race vest zipped in - it’s a great suit and has protected me well a few times.
I also have a couple Dainese Misanos and like them too, but haven’t crashed tested them. I have a Dainese GP replica on order now because i want to try kangaroo and custom fit, and I like the Misanos and the in-boot interface with the axial D1’s.