Safe and Cheap Unlock Code for Iphones?

I'm trying to find a website that will unlock my Iphone 4 for a reasonable price, and not scam me. I have been unsuccessful so far. I really don't want to pay more than $5 ( I only paid $2.33 on my last iphone from Ebay), but I can't find anything anymore for less than $30. If there's a reason for this, please let me know. And please also advise if you know a good trustworthy site (not hard on the pockets too!)

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