I have a dedicated server in house running 24/7 very much serving solely for the Scrapebox and Tweetattacks. Both tools request private proxies for better performance so I started to explore the private proxies business months ago. I have tried a few approaches and now settled on this approach and am satisfaction with its performance vs costs. Average price for 10-IP is around $25/month. Proxy b onanza offers $9.99/mth but it allows only 3gb bandwidth. My typical bandwidth usage is 10GB daily. If you use them for Tweekattacks only the bandwidth will go much less; still 3gb/month is hardly enough if you will use the proxies seriously. For a budget of $25-30/month I will suggest using VPS (virtual private server) with additional IPs. You will get 10-IP in that price range over 2-3 VPS accounts in multiple cities. Nowadays the VPS plans are as cheap as only $5/month! You can find lots of such offers thru gg. The major advantage of having multiple VPS vs one proxy provider is that you can make use of the VPS for blog farming, building in-house link wheels, and making data backup.... etc. So for the same price $25-30 you have more server resource to play around while having the core private proxy service in your own full control. I have two VPS for white hat clients. As cost of those servers has been covered by those clients I practically pay no extra cost on those proxies. I often run 3 SB and 2 TA concurrently supporting dozens of websites and 500+ twitter accounts over some 12-IP. Everything has been running smoothly and peacefully for months. The only catch is the installation of proxy server. I am using the Squid which is free. But the installation on linux server is not straight forward. If you are no good in server installation like me, you may need to spare tens of dollar to get someone from elance or scriptlance to install and configure for you.