I am usually buying

• Domains
• Hosting
• Mobile Recharge

But i saw many other things too we can buy. Newegg is also accepting Bitcoin so we can buy Hardwares for our computer. Also there are many other payment gateways which bridge Bitcoin with Fiat so we can use them to buy almost everything. Through Agencies who are providing facilities of CreditCard and DebitCard to get recharge with bitcoin, this reach extend to almost every product.