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Amazon currently has the RTIC 30 oz (BIG size) Tumbler - for just $9.99! Shipping is free with Amazon Prime or a $49+ purchase.
This is a best rated and selling item! This tumbler is stainless steel, double wall vacuum insulted and keeps ice for up to 24 hours.
This is a great alternative to the much more expensive YETI Tumblers. Many reviews say this tumbler is just as good as the YETI.
Amazon prices can change quickly.