I got a brand new knockoff 22.5 kettle from Sears for $40. I was able to use the lid, cooking grate, and charcoal grate for the basket. If you want the Weber brand, go for it. If you want something that is new, go with the cheaper option.
Lowes or Home Depot carries a knockoff 22.5 kettle (Masterforge?) that comes with a hinged lid, which seems popular for drums. If you are handy, that would be a good option. It is also in the $40 range, I believe.