There are usually some good specials running in the offers section of WHT. I believe BuyCpanel.com has a promo running for a $30 per month external dedicated server license. You should be able to find a single external VPS license for around $13-$14 per month.
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BuyCpanel is a good provider.
You can also try others like licensepal.com, instantcpanellicense.com
Off late there has been sever competition in this industry for licensing software.
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