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Amazon [amazon.com] has Official Nintendo Joy-Con 2 Straps (Light Blue/Red) for $10.
Shipping is free with Prime or on $35+ orders.

Walmart [walmart.com] has Official Nintendo Joy-Con 2 Straps (Light Blue/Red) for $10. Shipping is free w/ Walmart+ (30-day trial for $1 [walmart.com]) or on orders of $35+.