I've seen SERO here and there in posts here, but hadn't really tought much about it until this morning with your question/post...
Just doing a WIKI search on the threads for SERO on this site returned garbage - that is a LOT of references (due in part to SERO being in signatures and such) ... So I WIKI'd SERO on the Sprint website and found "Sprint Employee Referral Offer" ... I then WIKI'd that on this site and found the additional information ... Yes, search is your friend - but only when you have the right phrases =D>
Give that a shot ... I'm always looking to save a buck and am on a Corporate Partner Plan with a 25% discount... But if I can switch to one of these plans - with the discount, I'll save even more and it will be totally e-v-i-l

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Cheers