I've tracked ebay.com sales over four days last week.
Each day, I searched for "PS5" and "Xbox Series X", "Item Location: US Only", and auctions only. All the auctions I tracked ended that same day, as I did my searches on "Time: ending soonest".
The PS5's that I tracked, where the disk based version only.
I tracked 10 consoles of each brand each day, that had initial asking price that was in the ballpark of current selling prices. I ignored those with unrealistic high initial/reserve prices.
The reason why I checked US only, is because this is Microsoft's biggest market, and it's home market. I wanted to see how Sony faired in that market, as that is Sony most competitive market to succeed in.
For Sony:
Out of 40 listings, 36 sold, 2 listings removed, with an average of 17 bids per console sold, and at an average price of $884.83.
For MS:
Out of 40 listings, 26 sold, with an average of 12 bids per console sold, and at an average price of $728.19.
Conclusions:
- Two PS5 listings were removed for unknown reasons. Only 2 consoles in 40 did not meet initial/reserve price vs 14 unsold XSX.
- PS5 average selling price of $884.83 vs XSX's $728.19.
I have all this data tracked in a spreadsheet with links to every auction listing final sale price, time it ended, and listing number of bids with bid history.
If you see an problem with this, then please let me know. I may do another multiday tracking, but I don't expect the results to be much different. Feel free to do your own tracking based on the above critieria.