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They just dropped to their lowest price ever on Amazon.
https://smile.amazon.com/gp/product/B07NSL5XS5/

Recent Adorama deals have been for the ER4SR, ER4XR, ER3SE, ER3XR, ER2SE, but the ER2XR’s were unavailable.
These are the boosted/increased bass version of the more flat or neutral ER2SE.
[LIST][*]True high-accuracy sound with enhanced and extended bass[*]Metal earpieces with anodized finish[*]35+ dB of external noise isolation[*]Assortment of ear tips for the perfect in-ear fit[*]Detachable cable allows for easy replacement