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For a 400-point (aka 400 tie-point) solderless breadboard—the common half-size format—these are the best matches:

Best-value 400-point breadboards

• 400 Tie Point Interlocking Solderless Breadboard (400 tie-points, interlocking edges, self-adhesive backing) ($4.90)
• 400 TIE POINT INTERLOCKING SOLDERLESS BREADBOARD - Crystal (same 400 tie-points features, clear body) ($6.50)
• 400-Point Breadboard (400 points, compact prototyping board) ($4.70)

Other solid 400-point options

• Arduino Compatible Breadboard with 400 Tie Points (400 tie-points, includes dedicated power rails) ($9.25)
• Breadboard - Self-Adhesive (White) (400 tie-points, 0.1\" pitch, self-adhesive) ($12.65)
• Breadboard - Translucent Self-Adhesive (Clear) (400 tie-points, clear/translucent, self-adhesive) ($5.95)

If you also need jumper wires

• MB102 400 Mini Breadboard Point Solderless Prototype PCB Board + 65pcs Flexible Jumper Cable Wires (400 points + 65 jumper wires) ($13.25)

Premium-brand 400-point pick

• Breadboard (400 point) (400 points, quality general-purpose board) ($11.90)