Is Sis Boom BONNIE #551b worth grading?
Garbage Pail Kids · 1988 Garbage Pail Kids · full price guide →
Worth grading only if it gems
A PSA 10 Sis Boom BONNIE #551b brings $35.63 versus $2.94 raw — a $32.69 spread that covers an economy-tier ~$25 grading fee. A PSA 9 ($9.62) only about breaks even after fees, so the case rests on gemming.
- Raw (NM)
- $2.94
- PSA 10
- $35.63
- PSA 9
- $9.62
- Gem premium
- 12×
- As of
- Oct 4, 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 | $35.63 | +$7.69 | −$17.31 | −$117 |
| PSA 9 | $9.62 | −$18.32 | −$43.32 | −$143 |
Net = sale price − $2.94 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% | $16.12 | −$36.82 |
| 50% | $22.63 | −$30.32 |
| 75% | $29.13 | −$23.81 |
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 | $46.00 | best | 55/45 | 70/30 |
| PSA 10 | $35.63 | −$10.37 | 55/45 | 75/25 |
| CGC 10 | $21.00 | −$25.00 | 55/45 | 75/25 |
| SGC 10 | $21.00 | −$25.00 | 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.
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Grading Sis Boom BONNIE #551b — FAQ
Is Sis Boom BONNIE #551b worth grading?
A PSA 10 Sis Boom BONNIE #551b brings $35.63 versus $2.94 raw — a $32.69 spread that covers an economy-tier ~$25 grading fee. A PSA 9 ($9.62) 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 $35.63 versus $2.94 for a raw near-mint copy — a 12× premium as of Oct 4, 2026.
Which grading company is best for Sis Boom BONNIE #551b?
By resale value, BGS 10 leads at $46.00, ahead of PSA 10 at $35.63. 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.
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