I have recently had good experiences with tori.fi.

The thing with our local ebay, huuto.net, is that it caters too much to "professional" sellers and I rarely actually place bids because registered sellers reserve the right to reject the winning bid when the price is too low ("hintavaraus").
So what's the point of waiting for the auction to close when the chances of making a good catch are practically zero.
One can just as well drop the whole idea of online bidding completely - which is exactly what tori.fi is - just an online private ad section sort of.

And they seem to be generally cheaper than huuto or even ebay.

Just bought an Xperia XA2 for 60€, and there was a few more Sailfish compatible devices for similar prices.
A while ago I was also about to buy a Cosmo Communicator rather cheaply, the guy was friendly and seemed happy that someone is interested at all.

Of course this is more interesting for people in Finland, but there's no reason not to use it from abroad since most users are willing to send the item anyhow (although they don't always explicitely mark it).