PolarBottle.com offers free replacement caps and straps, just pay shipping ($4.66 for me).
But currently they have Team USA Polar Sport Bottles with Sport Cap on sale for either $5 or $6 depending on the color (select "Sport Cap").
The Gold and Red is the only $5 color. Pair it up with any other color ($6) for a total of $11. Add two free Sport Caps and two free straps then use coupon code "UPGRADE" for free shipping over $10.99.
Total comes out to $11 for 2 Polar Sport Bottles + 2 Extra Sport Caps + 2 Extra Straps.
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