Collar for 26.5" Weber Kettle

I have a 26.5 Weber, and I love the extra space to grill, however, I would love to add a collar to attach a rotisserie, and I am having a hard time finding any in stock. There seem to be only one or two online sites, and they are sold out.

Plus, it's starting to seem like it'd be cheaper to simply by a Weber 22 for rotisserie purposes. Collars for them seem to be plentiful and cheap.

Any help or advice would be appreciated.