Is Sis Boom BONNIE #551b worth grading?
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Worth grading only if it gems
A PSA 10 Sis Boom BONNIE #551b brings $31.72 versus $2.89 raw — a $28.83 spread that covers an economy-tier ~$25 grading fee. A PSA 9 ($20.00) only about breaks even after fees, so the case rests on gemming.
- Raw (NM)
- $2.89
- PSA 10
- $31.72
- PSA 9
- $20.00
- Gem premium
- 11×
- As of
- Aug 16, 2026
Break-even by outcome and fee
| If it comes back… | Sells for | Economy / bulk (~$25.00) | Standard (~$50.00) | Express (~$150) |
|---|---|---|---|---|
| Gem — PSA 10 | $31.72 | +$3.83 | −$21.17 | −$121 |
| PSA 9 | $20.00 | −$7.89 | −$32.89 | −$133 |
Net = sale price − $2.89 raw value − fee. Fee tiers are illustrative; plug your grader's current price into the calculator below.
Expected value — how often does it need to gem?
| Chance it gems | Expected sale | Expected net (standard fee) |
|---|---|---|
| 25% | $22.93 | −$29.96 |
| 50% | $25.86 | −$27.03 |
| 75% | $28.79 | −$24.10 |
At the standard fee this submission does not break even at any realistic gem rate unless the miss lands above the 9 price.
Which grader pays the most — and what a 10 takes
All centering standards →| Grader | 10 sells for | vs best | Front centering for a 10 | Back |
|---|---|---|---|---|
| BGS 10 | $41.00 | best | 55/45 | 70/30 |
| PSA 10 | $31.72 | −$9.28 | 55/45 | 75/25 |
| CGC 10 | $19.00 | −$22.00 | 55/45 | 75/25 |
| SGC 10 | $19.00 | −$22.00 | 55/45 | 75/25 |
Tolerances are each company's published centering standard for its top grade; surface, corners and edges must also be clean. Centering is the one you can measure yourself before you pay.
Full grade ladder
Raw conditions & history →| Grade | PSA | CGC | BGS | SGC | Graded |
|---|---|---|---|---|---|
| 10 | $31.72 | $19.00 | $41.00 | $19.00 | — |
| 9.5 | — | — | — | — | $22.00 |
| 9 | — | — | — | — | $20.00 |
Run your own numbers
Should I pay this?
Enter the seller’s asking price to see your net outcome per grade.
Other 1988 Garbage Pail Kids cards worth checking
Full set checklist →Grading Sis Boom BONNIE #551b — FAQ
Is Sis Boom BONNIE #551b worth grading?
A PSA 10 Sis Boom BONNIE #551b brings $31.72 versus $2.89 raw — a $28.83 spread that covers an economy-tier ~$25 grading fee. A PSA 9 ($20.00) only about breaks even after fees, so the case rests on gemming.
How much is a PSA 10 Sis Boom BONNIE #551b worth compared with raw?
A PSA 10 Sis Boom BONNIE #551b (1988 Garbage Pail Kids) sells for about $31.72 versus $2.89 for a raw near-mint copy — a 11× premium as of Aug 16, 2026.
Which grading company is best for Sis Boom BONNIE #551b?
By resale value, BGS 10 leads at $41.00, ahead of PSA 10 at $31.72. Fees and turnaround differ, so the best-paying label is not always the best net.
What centering does Sis Boom BONNIE #551b need for a BGS 10?
BGS publishes 55/45 front and 70/30 back centering as the tolerance for a 10 (Gem Mint). Off-center copies are capped below the top grade regardless of surface — measure yours before paying the fee.
Is your Garbage Pail Kids card centered well enough to grade?
Centering makes or breaks a PSA 10. Scan any card with Midpoint to measure its exact centering, get a grade estimate, and see what your copy is actually worth.
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