There isn't really anything I have an interest in buying online, to be honest, I would rather be buying my groceries and paying my bills directly with some of the Bitcoin I get rather than having to exchange it and then go and use my credit card or a Bitcoin debit card.
There might be some things I get interested in in the future, but for right now there isn't much I want to buy to be honest.
There is no point in buying anything with bitcoin unless you get a discount that is big enough to justify the hassle of having to buy bitcoin, then buy whatever good and services you want to buy. There has to be a justification to do that.