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Professor's Research
SWSH Black Star Promos · #SWSH178
$0.47latest TCGplayer median
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Price history (TCGplayer median, ~180 days)
PSA population (pop report, as of 2026-08-02)
Total graded
142
PSA 10s
58
PSA 9s
43
Gem rate
40.8%
Gem rate = share of all graded copies earning PSA 10. SWSH Black Star Promos gem rates → · all sets →
About Professor's Research #SWSH178's market value
Professor's Research #SWSH178 (Normal, Promo) from SWSH Black Star Promos (2019) has a market price of $0.47 raw as of September 20, 2026, the TCGplayer market price for this exact printing. For context, the median SWSH Black Star Promos card is $3.44; this one ranks #294 of 304 priced printings. Over the last 30 days the price has held steady (+0.0%), +0.0% over 90 days. Its 180-day range is $0.35 to $0.50.
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