I reviewed Lugaw's service and can vouch for it. Take a look:
7 SB sites + 10 URLs + RSS subscription = $5
I will submit your 10 URLs to 7 SB sites (includes digg,stumbleupon,mister-wong,spotback,a1-webmarks,mylinkvault,folkd)
Full report will be provided.
Please see my previous work here: http://www.netbuilders.org/services/ill-digg-thumbs-up-submit-mr-wong-your-url-25-times-13116.html
If you have any questions , please do contact me or send PM.