Usenet Fire is having a block sale. If you want a large block I'd go for the NGD deal posted yesterday https://www.ozbargain.com.au/node/514219, price is way better than what Fire is offering.
But if you're looking for a tiny block UsenetFire has decent prices. I personally don't have any experience with these guys, but Express is a decent backbone.
Usenet Fire is a new UsenetExpress reseller. So if you have UsenetExpress or UsenetPrime then these blocks will be redundant. Also applies for older content with NewsGroupDirect.
50 SSL connections.
Blocks obviously don't expire.
Retention is around 1100 days and they follow DMCA takedowns.
Block prices:
USD$2/50GB
USD$4/150GB
USD$6/250GB
USD$12/500GB
USD$20/1000GB