next best is, if you can find it at HD. They are clearing out the 18s for $224. If you can find Lowes movers from Post Office (ask), it will knock %10 off on top of $224.
Time - How long are you willing to wait?
Time - How much time are you will to spend going to garage sales?
Time - The number times a used WSM will show up on craigslist in your area depends on where you live.
If you really want to smoke, it is possible to do smoke ribs and chicken indirect on Weber kettle.
Rarely can you get a good deal on-line or at your local store.
I looked at my local CL for nearly 6 months, doing daily searches for WSM/Weber/webber/BBQ smoker/charcoal grill/etc. until I finally found one. If you are willing to wait and/or drive, you can find a deal on CL.