Bought a new mattress set recently. One of those very expensive ones from Mattress Firm, paying it off over a year. I knew I wasn't sleeping well on the old one, but man what a difference this makes.
We've had ours for 15 years... since Select Comfort. The only downside is the foam supports tend to get worn out over time, but the warranty covers that for a small amount.
I think I spent around $700 on the down payment, got a mattress, two super nice pillows, and a mattress cover. I will now be paying about $140/month for the next year.