Rogue makes the C-70 but I haven't seen it in stock for a long time -https://www.roguefitness.com/the-rogue-c-70-bar
Cap makes this 5 foot bar. It's OOS right now but it's nice and cheap - https://www.amazon.com/CAP-Barbell-Black-Olympic-Chrome/dp/B07FHHPPM8/ref=sr_1_41?dchild=1&keywords=cap+barbell&qid=1597393734&sr=8-41
Also OOS but maybe your best option is the 5 foot axle from Titan. There should be no wobble (aka whip) on this at all - https://www.titan.fitness/strength/barbells/olympic/axle-barbell-%E2%80%93-60-in./430024.html
https://www.amazon.com/CAP-Barbell-Black-Olympic-Chrome/dp/B07FHHPPM8
You can find a 5 ft barbell with 2 in diameter.