Bassinets are mostly pooh-poohed by parents because babies outgrow them so fast. But I can think of at least a few scenarios that may warrant them: you don't have room for a crib when your baby first arrives, you want the baby in your room for the first few months but don't have room for a crib there, your baby shares a room with an older child and they need separate napping spaces. These are just a few. So, if you are in the market for a bassinet, here are some of your options in a range of prices.
How long a baby will use a bassinet depends on the child and the size of the bassinet (and when they begin rolling and pulling up). If I recall, we moved my son from a bassinet to a crib around 4 or 5 months (we had the Stokke Sleepi system which I wrote about here). Because of their limited longevity, bassinets are commonly found on Craigslist, reCrib, and garage sales. And ask around - your friends or neighbors may have one you can buy or borrow.
I've heard of parents who used the bassinet of a stroller as a nighttime bassinet and I know some parents who have used small travel beds in the early months. Of course, there is also the traditional Moses basket route.
Again, bassinets aren't for everyone, but they can be really nice to have in some circumstances. Did you have one?