asbbearings.com

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  ZMBF 5056-30 (50mm x 56mm x 30mm x 62mm x 3mm) $21.89
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  ZMBF 5060-40 (50mm x 60mm x 40mm x 70mm x 5mm) $22.28
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  ZMBF 6070-50 (60mm x 70mm x 50mm x 80mm x 5mm) $26.95
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  ZMBF 610-10 (6mm x 10mm x 10mm x 14mm x 2mm) $4.29
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  ZMBF 811-10 (8mm x 11mm x 10mm x 14mm x 1mm) $3.08
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  ZMBF 812-10 (8mm x 12mm x 10mm x 16mm x 2mm) $5.45