FORTUNE -- If you buy a lot of iPhone apps or iTunes music, Apple (AAPL) gift certificates are almost as good as cash.
Indeed, there's a lively trade in iTunes gift cards on eBay (EBAY), where a $100 certificate will fetch anywhere from $82 to $109.99 on a Buy It Now basis.
Now, as The Verge notes in its latest "Good Deal" tip, Walmart (WMT) has entered the market, selling electronically delivered iTunes gift cards for 20% off. There's no sales tax, no delivery charge, no dealing with sketchy eBay sellers.
The catch is that like any online purchase, you can't make it without giving Walmart your name, address, e-mail and payment information (PayPal and major credit cards accepted).
Note: Walmart has business relationships with a long list of suppliers, from Baby George clothes to Gold's Gym exercise equipment.
If all that is okay with you, $80 is a bargain. You can get it here.
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