As one of its daily deals, Best Buy offers the LifeCHARGE Battery Case for Apple iPhone 5/5S in Black, model no. ONT-PWR-35171, for $24.99 with free shipping. That's $75 off list and $33 under the lowest total price we could find for a similar case elsewhere. It allows for up to eight hours of additional talk time on 3G networks and a built-in 2300mAh lithium-polymer battery. Deal ends today.

Update: It's back in stock.