I don't understand why a search on eBay did not work for you. I find plenty of both. Enter the Search term and then look on the left side menu for Completed / Sold box to tic. Look at items that have more than one bid.
For the DC H10-13.4 I find ones that sold via auction typically between $150 - $250.
The Bose X sells in the range of $250 - $350.