Are you looking for a budget solution, or something on a higher quality more robust network? Are you looking for just a single server with 100mbps of bandwidth? What type of budget do you have?
As pointed out, www.OrangeFiber.com is going to be one of the absolute cheapest providers you’ll find. They have pure cogent bandwidth and market their servers are extremely affordable prices.
Another extremely affordable low-budget provider that could probably set you up with a similar deal would be www.EGIHosting.com. They run off HE.net bandwidth and offer far lower pricing than HE direct.
However, if you’re looking for higher quality multi-homed bandwidth there are a whole slew of providers that can meet your needs. Two I recommend taking a look would definitely be www.CRNC.net and www.SteadFastNetworks.com.