I have posted this here more than once:
Buy a lead roof vent at Lowe's or the hardware store of your choice.
Cut it with tin snips as needed. Attach with 2-sided tape, epoxy, rubber cement, Walther's Goo, hardware store Goop, an so on.
It will be enough lead for years, most likely. Wash your hands after handling it.
That's it.
Roof vent; tin snips; glue; common sense. Cheap.
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As for "being bad for the environment", I don't plan to toss my weighted RS in with the
unicorns, puppies and rainbows.
(Psst - I also still have a piece of asbestos cloth that is used on those rare occasions when I use a soldering torch at the bench rather than an iron; I don't lick it or hold it over my nose.)