74F245 Octal Bidirectional Transceiver with 3-STATE Inputs/Outputs (Digi-Key $0.72 backordered mfgr claims in production) sinks 24 mA at the A Ports and 64 mA at the B Ports sources 3 mA at the A Ports and 12 mA at the B Ports
Generic 74LS245 (Jameco, $0.39) sinks 24mA sources 15mA at A or B.
74F545 Octal Bidirectional Transceiver with 3-STATE Outputs (Digi-Key $2.84)
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