It depends on what you want to buy.There's are different merchants who accept bitcoin that sell different products.Below is list of some merchants you can pick one according to your need
WordPress.com – An online company
that allows user to create free blogs

Overstock.com – A company that sells
big ticket items at lower prices due to
overstocking

Amazon – An online company that sells
almost anything.

Target – An American retailing
company

CVS – A pharmacy shop

Subway – Eat fresh

Victoria’s Secret – A lingerie outlet

Namecheap - Domain name registrar

Bitcoin.Travel – a travel site that
provides accommodation, apartments,
attractions, bars, and beauty salons
around the world

Pembury Tavern – A pub in London,
England

Old Fitzroy – A pub in Sydney,
Australia

The Pink Cow – A diner in Tokyo,
Japan

Virgin Galactic - Richard Branson
company that includes Virgin Mobile
and Virgin Airline

The Pirate Bay - BitTorrent directories

Reddit – You can buy premium
features there with bitcoins

Zynga – Mobile gaming

PayPal / Ebay - Credit card / payment
processor / Auction

Tesla – The car company

OkCupid – Online dating site

4Chan.org – For premium services

EZTV – Torrents TV shows provider

Mega.co.nz – The new venture started
by the former owner of MegaUpload
Kim Dotcom

Lumfile – Free cloud base file server –
pay for premium services

Etsy Vendors – 93 of them

PizzaForCoins.com - Domino’s Pizza
signed up – pay for their pizza with
bitcons

Tigerdirect – Major electronic online
retailer

CheapAir.com – Travel booking site for
airline tickets, car rentals, hotels

Expedia.com – Online travel booking
agency

Zappos – Online retailer

Whole Foods – Organic food store (by
purchasing gift card from Gyft)

Bitcoincoffee.com – Buy your favorite
coffee online
Grass Hill Alpacas – A local farm
in
Jeffersons Store - A street wear
clothing store in Bergenfield, N.J


Seoclerks.com – Get SEO work done
on your site cheap

Namecheap – Cheap domain
registration company

Mint.com - Mint pulls all your financial
accounts into one place. Set a budget,
track your goals and do more
with your money, for free! ( Source:
mint.com )

TechCrunch.com – IT blog

Fancy.com - Discover amazing stuff,
collect the things you love, buy it all in
one place ( Source: Fancy)

Bing by Microsoft – 2nd search engine
to Google
Bloomberg.com – Online newspaper

Humblebundle.com – Indie game site

BigFishGames.com – Games for PC,
Mac and Smartphones (iPhone,
Android, Windows )
Suntimes.com – Chicago based online
newspaper
San Jose Earthquakes – San Jose
California Professional Soccer Team
(MLS)
Square – Payment processor that help
small businesses accept credit cards
using iPhone, Android or iPad
Crowdtilt.com - The fastest and
easiest way to pool funds with family
and friends (Source: crowdtilt )
Lumfile – Server company that offers
free cloud-based servers
Museum of the Coastal Bend - 2200
East Red River
Street, Victoria, Texas 77901, USA
Home Depot - Office supplies store
Kmart - Retail products store
Sears - Clothing and household
products, electronic store
Gap, GameStop and JC Penney –
have to use eGifter.com
Etsy Vendors – Original art and Jewelry
creations
Fight for the Future – Leading
organization finding for Internet
freedom
i-Pmart (ipmart.com.my) – A Malaysian
online mobile phone and electronic
parts retailer

Apple’s App Store - Buy music and any
app on the Apple AppStore with
bitcoins


Yacht-base.com – Croatian yacht
charter company

Euro Pacific – A major precious metal
dealer
CEX – The trade-in chain has a shop in
Glasgow, Scotland that accepts
bitcoin


Intuit - an American software company
that develops financial and tax
preparation software and related
services for small businesses,
accountants and individuals.

Newegg.com – Online electronics
retailer now uses bitpay to accept
bitcoin as payment