I take my words back, HU proxies does not belong to category 'very hard' but for sure 2k is out of question.
Try the proxy below, remember to use firefox, it's the most proxy friendly browser and actually does support SOCKS proxies that are not coded according to SOCKS 4 and 5 RFC.
I've a scan still going, I'll PM you with more soon. After you test the above proxy, you should agree with me; it's not about how much you can leech proxies from the internet, it's all about how much and how fast you can port scan for unlisted proxies![]()