Front
1988 Topps Garbage Pail Kids Original Series 11 #421a Groovy Greg front
Back
Price history · PSA 10
image from latest verified sale
1987 GARBAGE PAIL KIDS STICKERS

GROOVY GREG

STICKERS
View all GROOVY GREG cards →

PSA 10 · 1988 Garbage Pail Kids Original Series 11 →

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Pop
6
Card # 421a
Garbage Pail Kids
TCA Value iTCAxis Value is a recency-weighted market value from REAL sales of this exact card+grade (recent comps count most, outliers stripped) — steadier and harder to game than a single 'last sale', which can be one lucky auction or a shill bid. When a card has few or no recent comps, we estimate transparently from its own older sales, its other grades, and comparable cards (same subject/set/rarity tier), factoring subject trend and scarcity — and we LABEL it as an estimate until real sales arrive.
Confidence
★★★★★
See Active PSA 10 See Sold PSA 10 View on PSA
real comps est. — own older sales est. — never sold unsold
Last Sale
Avg Sale (30d)
across — sales
Volume (30d)
— vs prior 30d
Comp Sales (All)
all grades
vs 1 mo
vs 2 mo
vs 3 mo
High Low Avg sales Subject trend

🧬 Should I slab it?

Worth grading

About a 42.1% gem (PSA 10) rate on this set's PSA pop. Expected value after a $19 grade is roughly $44 vs a raw copy around $7 — grading pencils out here, especially if you hit the $79 ten.

Gem (PSA 10) rate
42.1%
this set · 36,368 graded
PSA 10 value
$79
if you hit the ten
Grading cost
$19
PSA Value tier
Expected after grade
$25
vs raw ~$7 est.

Probability-weighted across grades using PSA population as a proxy for this set’s cut & print quality, minus the grading fee. A guide, not a guarantee — centering and eye-appeal on your specific copy decide the grade.

🗑️ The Garbologist says…

Trending Up
The Garbologist has been digging through this one's trash. Liquidity read: 3 recorded sales on file (2 in the last year), trading only a few times a year — a limited-confidence sample. The recent trail reads $62 → $70 → $80 — a clear march higher. Across the trailing window the median has moved +21% ($75 vs $62). Net-net, the momentum points up — real buyers are paying more, more often. Not a promise, just what the garbage is telling us.

Automated analysis generated from this card’s real recorded sales and PSA population data — no opinions, no predictions guaranteed. Entertainment and research only, not financial advice.

Value by grade — Stickers (this card)
Stickers pop 9
PSA 10 $79 pop 6 3 sales
PSA 9 $19 pop 2 2 sales
PSA 8 $9 EST. no sales
PSA 7 $4 EST. no sales
PSA 6 $2 EST. no sales
PSA 5 $1 EST. no sales
PSA 4 $1 EST. no sales
PSA 3 $1 EST. no sales
PSA 2 $1 EST. no sales
PSA 1 $1 EST. no sales
GPK Price Guide
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