With orders of $25 or more, Amazon offers the Stanley 4-in-1 Pocket Screwdriver, model no. 66-344, for $1.38 with free shipping. (Non-members can spend $35 or more to qualify for free shipping.) That's a buck under our mention from a little over a year ago and the best deal we've seen. (It's also at least $1 less than you'd spend at a local retail store.) It includes two double-ended magnetic bits in sizes 5/32", 1/8", 0PT, and 1PT.
Note that this item is part of Amazon's "add-on" program and can only be purchased with an order of $25 or more.