Purchasing Used Games Online
While it may be tempting to purchase a game at a fraction of its retail price, there is no way to guarantee the quality of the disc before completing the purchaseSo it is a "buy at your own risk" situation.
Online Retailers
There are many online retailers which sell games, many at lower prices than at the shopsAmazon sells a large range of games, and preorders on some games are also available10-15 dollars of savings can be made by purchasing a game from Amazon.
eBay retailers also offer very reasonable prices for new gamesOne store offers FIFA 10 for as low as $57 after postage has been addedAlways check the feedback of the storeIf everything adds up, go ahead with the purchase and take advantage of the excellent deals.
Consider Digital Distribution
There are a few digital distribution services available, offering differing valueThe Xbox Live Marketplace and the Playstation Store offer some full games at cut pricesSteam is the best value for PC games, with occasional specials reducing games in price by up to 75%.
However, Sony's PSP Go services are mediocre at best, with games being at the same price as their physical counterparts.
Roundup
There are number of ways which can be utilised to purchase high quality games at reasonable pricesBe sure to take advantage of them all
To some this may seem a given, but many people may simply forget to compare prices between retailersA game which is selling for $109 at one retailer may be as low as $90 at another, or lessUsing resources such as Shopbot are key to getting the best dealDon't be afraid to quote a lower priceMost retailers will match or even beat a price if a purchase is on the line.
Some stores may neglect to lower their prices of specific gamesFor example an older game such as Tomb Raider Underworld may be as expensive as $100, its release retail price, at some storesMost will stock it at the budget price of $50, but even further discount can be found at some storesSome copies at target have been seen as low as $35, which is a particularly low price for a high quality release.
Department Stores such as Myers and David Jones should usually be avoided, as these stores generally keep their video games stock at its release retail priceHowever, occasional good buys can be found in the bargain bins of such stores, so do not discount them entirely.