Unlocked, the Galaxy S4 retails at around $US600 but for those hunting the new Samsung flagship, the best prospect is found at Walmart.

The GS4 on the U.S.-based giant retailer is being sold in different price tags but the most attractive to date is the one with a $US168 price tag that comes with a two-year AT&T contract.

Special arrangement between Walmart and the leading American carrier would allow GS4 buyers to save more than $30 as AT&T normally offers the same package for $US199. However, those availing of the promo will have to wait until the end of May to get hold of the top-notch Android handset.

Walmart will not stock the mobile phone until Mar 30 but the ubiquitous store has begun taking pre-orders, according to Gotta Be Mobile.

The same procedure applies to Samsung fans wanting to use the GS4 on Sprint. The network provider sells the device for $US250 but buyers opting to get it through Walmart will get a $26 discount, big enough to get S4 accessories.

Also, T-Mobile, which recently has adopted an aggressive posture to win over more subscribers, is on the Walmart GS4 promotional menu. But at $US198, the offer seems not too irresistible compared to the telco's rivals.

Scanning T-Mobile's other GS4 packages, it might look like that the company dangles the best price around at $US150. Note, however, that the same bunched plan includes a monthly payment that covers the GS4 full price.

Now in a full rollout mode, the GS4 is expected to attract millions of buyers worldwide, with retailers and distributors devising schemes to lure more buyers to their fold.

While the normal come-on is cheaper price, experts warned that consumers should also consider other factors like storage space before parting with their cash. The 16GB GS4 model, for instance, is left with less than 9GB of usable disk room.

It is best then to go for the 32GB configuration and up as Android does not allow the installation of apps on microSD, leaving the expansion slot useless for Galaxy S4 owners who tend to chew in loads of softwares on their handsets, experts added.