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Do you know of any stores that install either of those?

From rapaleeman,
If you buy a Power Support, the Apple store will usually install those for free. Just take it in there with you and talk to one of the nerds at the Genius bar. Also, AT&T stores will usually put them on there for free too if you buy from them.
 
I would recommend either powersupport or SGP. Both are good to use. I used PS on my old 2/3G and SGP for my i4.
 
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