You can try to garage sale for btc. Find something you don't want anymore and sell it for btc. I had a couple of old iPhones that I was going to trade in for a new phone but sold them for btc instead.
You could also just sell items you have for fiat then use it to buy bitcoin. I've done that a few times as it's easier to sell for cash then buy I find. The market to buy things in actual bitcoin is small at the moment, though it is growing.
