Not a bad price for these speakers including delivery, I don't think I've seen them cheaper than this and they are a really good set of speakers. Many YouTube reviews are praising them highly, I can also vouch for them as I use them every day and they sound fantastic and are really powerful too.
There also seems to be a further 5% off when purchasing the optional speaker stands by Edifier (priced at $200) that is applied at checkout.
But you can just buy the speakers for $400 with free delivery.
I don't know when this offer expires?
Link to manufacturer's website for more detailed information:
Speaker stands here: