@smidgie-
I've been happy with Panasonic ErgoFit Wired Earbuds. I think the sound is very good for under $10 ear buds. Three sizes of ear pads are provided. The pads are silicone, not foam as you requested, but I find them comfortable. The shape of the tube over which the pads fit is oval, which gives a slightly oval shape to the pads, and this seems to fit my ears very well (with the larger pads). They are available in several colors.
https://www.amazon.com/Panasonic-Headphones-RP-HJE120-G-Ergonomic-Comfort-Fit/dp/B003ELYQHK/
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