Is That Time I Got Reincarnated as a Slime - Booster Box Case worth opening?

That Time I Got Reincarnated as a Slime - Booster Box Case: $3,737.29 of card set value vs a $1,897.56 price (1.97× value ratio). It is worse to open than 30 days ago. Expected value is a model estimate from set-wide Inkwell Fair Values and typical pull rates — individual boxes vary.

How is the sealed product price tracked?

We track sealed product prices daily and blend them into an Inkwell Fair Value. The chart shows historical price movement over time.

What does the value ratio mean?

The value ratio compares what you can expect to pull from the product (or, for products without a pack model, the total value of the set's singles) to the product's price. Above 1.0× means the expected singles are worth more than the price.

How often are sealed prices updated?

Sealed product prices and the value ratio update daily as part of our automated price pipeline.

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Union Arena

That Time I Got Reincarnated as a Slime - Booster Box Case

Name: That Time I Got Reincarnated as a Slime - Booster Box Case
Brand: Union Arena
SKU: union-arena-ue20bt-that-time-i-got-reincarnated-as-a-slime-that-time-i-got-reincarnated-as-a-slime-booster-box-case
Price: 1897.56 USD
Availability: InStock

Booster Box

Current Price

$1,897.56

7D Change

30D Change

Last updated: Oct 8, 2026

Browse UE20BT: That Time I Got Reincarnated as a Slime Cards →

Monthly Price History

Month	Avg	Low	High
Oct 2026	$1,891.88	$1,871.05	$1,897.56
Sep 2026	$1,867.27	$1,833.27	$1,871.05
Aug 2026	$1,698.79	$1,524.98	$1,833.27
Jul 2026	$1,524.98	$1,524.98	$1,524.98
Jun 2026	$1,524.98	$1,524.98	$1,524.98
May 2026	$1,524.98	$1,524.98	$1,524.98
Apr 2026	$1,524.98	$1,524.98	$1,524.98

Worth Opening?

vs UE20BT: That Time I Got Reincarnated as a Slime singles

Card set value

$3,737.29

Box price

$1,897.56

Value ratio

1.97×

vs 30d ago

▼ worse

$3,737.29 of card set value vs $1,897.56 box price — worse than 30 days ago. The set's 265 priced cards are worth 1.97× this box's price (was 2.35×).

Value ratio compares the card set value (the Inkwell Fair Value of the set's priced cards, sealed products excluded) to this product's price. Higher is better for buyers.

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Frequently Asked Questions

Is That Time I Got Reincarnated as a Slime - Booster Box Case worth opening?: That Time I Got Reincarnated as a Slime - Booster Box Case: $3,737.29 of card set value vs a $1,897.56 price (1.97× value ratio). It is worse to open than 30 days ago. Expected value is a model estimate from set-wide Inkwell Fair Values and typical pull rates — individual boxes vary.
How is the sealed product price tracked?: We track sealed product prices daily and blend them into an Inkwell Fair Value. The chart shows historical price movement over time.
What does the value ratio mean?: The value ratio compares what you can expect to pull from the product (or, for products without a pack model, the total value of the set's singles) to the product's price. Above 1.0× means the expected singles are worth more than the price.
How often are sealed prices updated?: Sealed product prices and the value ratio update daily as part of our automated price pipeline.