The assumed requirements are:
Cutting Width: To fit through fence gates, 30" width recommended.
Price: Original was $600 ish.
Design: Rick has mentioned rear engine multiple times. Probably for ease of usage.
Condition: I would recommend a newer mower (better condition) as compared to a cheaper price.
Location: Rick lives in Edmond/OKC area. Limit the search area.
There are several mowers that might meet requirements on FB marketplace:
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This ^^^^ This is the way. He's already got enough broke **** that don't work like it's supposed to.
If we're gonna do this we need to do it right. He don't need a hunk of **** that he'll have to have hauled off in a year when it quits.