Cold Splice Wire Tap (UB) - 10 pack : ID 1494 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Printable catalog (PDF) - Adafruit

FIXITOK 160pcs T-Tap Quick Splice Connector Kit, 60Set T-Tap Wire Connectors Self-Stripping with Insulated Male Quick Disconnect Terminals + 40pcs Quick Splice Electrical Connector: : Industrial & Scientific

Kiss those days of heat-shrink, melted jacketing and clumsily-arranged third-hand tools goodbye! Go 'cold splice' with these snap-able plastic splices

Cold 2-Wire Splice (UY) - 10 pack

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Kiss those days of heat-shrink, melted jacketing and clumsily-arranged third-hand tools goodbye! Go 'cold splice' with these snap-able plastic splices

Cold 3-Wire Splice (UR) - 10 pack

FIXITOK 160pcs T-Tap Quick Splice Connector Kit, 60Set T-Tap Wire Connectors Self-Stripping with Insulated Male Quick Disconnect Terminals + 40pcs Quick Splice Electrical Connector: : Industrial & Scientific

Solid-Core Wire Spool - 25ft - 22AWG - Red : ID 288 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Cold Splice Wire Tap (UB) - 10 pack : ID 1494 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Snap-action 3-Wire Block Connector (12-28 AWG) - Pack of 3 : ID 866 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Prototyping, Wiring Products Category on Adafruit Industries

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IDEAL Splice Kit 2-Ports Black in the Wire Connectors department at

Gardner Bender 22-10 AWG Tap Splice Assortment (10-Pack) 15-2210 - The Home Depot