The Galaxy S4 now sells for only $50 at Radio Shack purportedly for the 2013 Black Friday festivities, immediately sparking rumours that release date for its replacement, the Galaxy S5, is coming a little sooner than expected.

As the usual case, the Galaxy maker is mum on the matter though Android watchers could not help but to speculate on the new handset, which gradually is becoming the focus of Sammy fanatics.

In the meantime, Radio Shack now packs on the most irresistible GS4 promo package to date, which the retailer dubbed as Trade & Save promotional campaign, Gotta Be Mobile said in a report.

As the name implies, buyers will need to bring over a working smartphone and surrender it to secure the offered deal. Depending on the condition of the handset to be swapped, GS4 bargain hunters can get the phone from $50 to $90 or even for free, that is if the device will be turning is in a pristine state.

The promo is already on and should run its full course through the Black Friday week or even beyond. While other retailers will surely include the Galaxy S4 with their respective Black Friday deals, the Radio Shack dangle is the best lure so far for consumers considering that when the Android smartphone debuted in April this year, the contract price require a $200 upfront payment.

The quad-core device now counts tens of millions in total sale, easily becoming one of Samsung's bestselling smartphones.

There were talks, however, that the GS4 sales movement is slowing down, which should partly explain its shrinking price point. But for some analysts, the trend points to practical inventory clearing, supposedly in preparation for the arrival of a new handset model from the South Korean tech giant.

The popular consensus would be the Galaxy S5 though earlier reports have indicated that arrival time for the new Samsung hero phone will not happen until the first quarter of 2014. If Samsung is changing its plan and pull off an earlier GS5 launch, no one can tell for now.

What's certain is the company should be hard at work for its 2014 flagship and some of its killer features were already hinted by Samsung officials.

The Galaxy S5 is likely to feature 64-bit computing that is served in the quad-core class, unlike that of Apple's iPhone 5S, with 4GB of RAM, a metallic frame and a flexible display screen - using Samsung's YOUM display panel technology - for added durability.

The latter attribute was seemingly confirmed by a Bloomberg report last week, which claimed that works are currently underway for Samsung to rollout a smartphone with wraparound display or three-sided screen. Target date of outing is pegged for middle part of 2014.

That release date, however, is not in sync with what analysts believe as the likely Galaxy S5 release date - set between January and March next year.