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R4? Judging by the lack of replies I don't think I'm the only one who has no idea wtf you're talking about.
r4ds noob...
I bought mine from dealextreme for under 40 shipped
Personally, I like http://realhotstuff.com/
They charge $40 for the R4 with about $4 or $5 shipping and it'll get to you in 3 days (if they're in stock).
R4 isn't the only homebrew solution, and isn't the best... it's just the most well known. Check out the M3 Real (with Sakura translated firmware) or the DSTT
Yeah, funny how that works out. The R4 is basically a 1:1 clone of the 'M3 simply'. they even use the same firmware!