I would try ebay and other known hardware forums local to your country but ebay usually have a lot of old unix boxes and equipment for sale especially cisco equipment - a lot.
One thing is I always avoid trying to ship in any equipment from overseas, I always search ebay for somebody local to my country who has the equipment that I want. So I can go down to physically check and test the equipment myself and usually can still negotiate the price down a little face to face or get the seller to include more free stuff. But If there isn't anybody local then I don't buy, but usually there is.
Sometimes just reading the newspaper look out for things like baliffs or sheriffs sale or maybe a company closing down so auctioning off their servers can sometimes get good deals there too.
Over the years I've collected from various sources old ipx workstations, sparc2 sparc10, sparc5, sparc20 ultra1 servers. Some time back there was even an old E3K that I very much wanted to get but the price wasn't right.
Right now I'm in the market for a sun scsi multi-disk pack, I've found a possible seller but would need a bit of time and a little more convincing to get them to lower the price down a little more.
good luck