My kids' skates are always outgrown before they break down, so I usually put them on eBay. I buy good skates and take care of them very well. Had no luck selling for the first time ever, so I have two pair of perfectly good skates sitting here, gathering dust. (Jackson Freestyles 4.5B/Mark IV blade, 5B/MK Double Star blade.)
I also have 2-3 pairs of my own skates that are broken down. One pair have Figure blades one them, but I rarely use them. The other are my spares, in case something happens to these. They're not in great shape, but I could use them to teach in a pinch.
www.sk8stuff.com has the "skate exchange" lister, which lets you list skates/boots/blades to sell, but it's not well-known.
www.myskatingmall.com also lets you list stuff, but I feel like there's not a lot of used things listed, it's mainly their online vendors displaying new things. They have so many listings (every model/size separate) that it makes finding anything else difficult. (No criticism intended.)
Since I always know what I want and what size to get (measuring carefully), I have gotten some good bargains on gently-used skates over the internet, but that's not always the case. I once bought skates on ebay that were at least 20 years old and useless. I never thought to ask about the age. Another time I bought two pair of skates from an online vendor and they sent regular-width when I needed (and ordered) wide skates. There were two terrible purchases: the online photo showed perfect skates, but that was a stock photo. When the skates arrived, one was noticeably yellow in color; it must have been in a window for a while so it discolored, but its mate was white. The last mishap I had was ordering used Freestyles with Coronation Ace blades. Photo looked great and it included soakers. In the picture, the soakers were disguising the fact that the heel plate stuck out a good 1/4" longer than the sole. (The blade was pretty much shot, too.) I had to buy new blades in the proper length locally and get them mounted.
Has anyone ever sold skates through the Board's "Equipment and Services Available" section successfully? I'd be willing to list the skates I have on hand and see if I get any response.