Where can I buy an iPhone 3GS?

I need a reliable place to get an iPhone 3GS from. You see, my mum wants one for her birthday and I have looked on eBay, Amazon, and other places and they don't seem very reliable.
Do you know any reliable places to buy one?

I would say Craigslist but sometimes people are weird on Craigslist. So eBay would be your best bet. It's always safe to buy from people who have good feedback, and you're protected from any purchase with the "eBay protection plan" don't be scared to buy stuff from eBay. Also the iPhone 3GS is selling for around $100 for the 16GB Version.don't pay anything over $100 for an iPhone 3GS.

You will only be able to find it on websites like Amazon, Craigslist and eBay now. Samsung won an injunction from the ITC (International Trade Commission) that blocks it from being imported into the US or sold by anyone such as Apple, AT&T, Best Buy, etc.

The IP 3GS ism FOUR years old and discontinued by Apple, so not being sold either by Apple or the networks

It was a poor phone in 2009, when it was released, and quite frankly an overpriced relic today

VIRTUALLY EVERY TOUCHSCREEN PHONE IS BETTER eg 3.15 MP CAMERA NO FLASH
Here is a comparison with the "entry level" Samsung Galaxy Ace http://www.gsmarena.com/...hone2=3724

You can get the Sam Gal Ace for £80.00 at CPW New Warranty.

iPhones only feature is the high price and people assume that because you pay a high price you get quality. With Apple its different you just pay a high as Apple set prices to include a very high profit mark up.

My advise is to you is don't look for phone bought out in the last decade, stay out of the Orchard as iPhones are years behind the market
Eg The IP5 is 18 months behind Samsung release the SGS II the SGS II is the BETTER PHONE!

Finally the Mid range Sam Gal Ace 2 and Lumia 620 both are Dual Core and have a secondary camera for video call are as up to date as you can get and have all the features found on a PREMIUM PHONE http://www.gsmarena.com/...hone2=5147

I do know that they both cost less than even a pre owned IP 3GS

Are you in the UK? Try CEX. The grading system is done by letters:

A- Phone in as new/mint condition with charger, original box and all accessories.

B- Working phone in good condition with slight cosmetic blemishes. Charger supplied. Missing one or two accessories or original box.

C- Phone in poor cosmetic condition. Charger supplied but missing accessories and packaging.

So:
Apple iPhone 3GS 8GB Black, O2 A is the Mint condition, boxed and all accessories
Apple iPhone 3GS 8GB Black, O2 B is the Good condition, slight scratches or marks but works
Apple iPhone 3GS 8GB Black, O2 C is the Poor condition, heavy scratches or marks, chips and cracks (like in the screen) is possible but still works