I know you can colo in Scranton, about 2 hours away from Philadelphia. Not sure about any others though.
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There are some co-location providers in Philadelphia, but there aren't many that are affordable for a web host's budget. Those that tend to have space are usually limited in either capacity or capability.
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I just swung by their site, their bandwidth prices seem high no?
I haven't looked over the bandwidth prices for any of them in quite a while, but generally I would say you're correct.
How often will you be needing to visit the datacenter? If you can extend the distance from Philly, you might consider Dedicated Now: http://www.dedicatednow.com/?services-collocation= I'm not sure what they charge beyond their package bandwidth, though.
I'm around an hour from Philly, in South Jersey, and after searching quite extensively for the right colo provider back in 2007 I ended up with www.pryme.net in Virginia. I hosted my box with them for around 2.5 years and was always quite happy with their service. The distance might not be so good if you need to visit the DC very often, though (maybe 3-3.5 hour drive each way and you definitely do not want to get stuck in the rush hour traffic around there).
There are a bunch of them, including Internap and smaller resellers at the huge Switch and Data facility at 401 N Broad. The challenge is finding a good price on 1 rack with some bandwidth.
If you have things set up already in terms of knowing that you have the exact hardware config you need, just add a remote access card that lets you power the machine off and on and remotely access the BIOS, and ship it to any place in the Northeast that has a 24x7 staffed facility. This should let you get much more competitive quotes.
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