Yottanews also offers a free (trial) newsgroup service, including binary groups. You just need to do a quick registration to set it up (no credit card or other info needed) and you can then download up to 1GB per IP address.
The biggest problem is that the speed is extremely slow (256kbits) and the retention is only about 2 or 3 weeks. But you can't beat the price.
http://www.yottanews.com:8080/freeaccount.php
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