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You do tend to get what you pay for in screen protectors; $2.50 for six wouldn't give me warm fuzzies about it being worthwhile.

I believe SGP/SPIGEN has a combo set front & back; I've used their Steinheil Crystal Ultra Oleophobic before and they were great. Never tried their back protectors; I have my 5s in the Apple leather case so am less concerned.

For the front, I bought a Green Onions Supply oleophobic and it's great; literally can't tell it's on there unless I look closely.
 
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