I purchased this basket for my WSM 14.5. It fits perfectly and does the job. Easy clean up. 7" Bottom Diameter, 12" Top Diameter, 5.75" Tall and 4.25" Depth. ~$30 bucks on Amazon.
I had a new fire-basket made for the 14.5.
You'd be forgiven for thinking it's expanded metal. It isn't. It's a piece of 3mm 304 SS sheet that has been laser cut. Formed, then welded. It's very robust.
The grate is a titanium camping grill that is the exact same size as the stock 14.5 charcoal grate. I attached it to the fire basket with 4 x SS zip-ties.
The basket measures 10.2" in diameter and is 7.5" deep. (I don't recall the depth of the stock fire-basket). There is still enough room between it and the deflector plate to add fuel through the door if required.
At the equivalent of US$37 I think it's kind of budget, (keeping within the thread title), in comparison to other bbq accessory providers.
Considering how much CNC time would be required for those SS sheets, yeah, that's an incredible deal for a nearly indestructible basket. Expanded sheet is also a much more efficient use of sheet, practically no waste.