They have some economy models now that work pretty well. I needed one in a hurry, I was in a foreign land (Washington state) so I bought one at O’Reillys for about $60 - it’s made out of some kind of high-grade plastic, looks a lot like the aluminum model. Has worked fine so far. I see online Home Depot sells them for $32, Walmart for $38. I don’t know if that’s mail order or on the shelf.

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1986 300SDL, 362K
1984 300D, 138K