Building on the D latch from the previous video (https://youtu.be/peCh_859q7Q), the D flip-flop has a "clock" input instead of an "enable" input and stores data just on the rising edge of the clock.
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You can get all the components used in this video from any online electronic components distributor for a few dollars.
Complete parts list (everything in this video):
1x 74LS02 (Quad two-input NOR gate)
1x 74LS08 (Quad two-input AND gate)
2x 330Ω resistor
1x 1kΩ resistor
1x 0.1µF capacitor
2x Momentary "Microtivity 6mm tact switch"
22 gauge wire
USB charger and cable or some other 5v power source