AudioQuest Jitterbug USB noise filter, two

Selling two AudioQuest Jitterbug USB noise filters with all original packaging. Price listed is for each. I prefer to sell as a pair, but will sell singly (see below re using as a pair).
Bought new 12/16 from authorized dealer, used in house with no smoking, pets or children, excellent condition. I am selling only because my new digital front end will not accommodate more than one. As reviews have said about these filters, they worked great for me and are a gigantic value at their price. I auditioned them extensively against another noise filter costing six times as much and these sounded better. I used three with my previous digital front end--two in series (plugged into each other) between DAC and USB wire, and one in unused USB port on DAC. AQ website says not to do this (use in series) but they sounded better this way. (I asked AQ about this and they said there are too many equipment combinations to account for all.) Buyer pays shipping and 3% Paypal.