I used a Schwinn Trasher for like 5 years of road biking. It cost about $30 on amazon. Solid helmet. I am endurance cyclist and I ride about 2500 miles a year. The thing is, every bike helmet that's sold in the US must go through a CPSC certification. No need to spend $$$ on it. They all offer similar protection. The difference comes in weight, styling, ventilation, MIPS etc.
But whatever you do, don't buy a used helmet. Once a helmet hits the ground in a crash, it is done for. Also, the foam degrades after about 5 or 6 years compromising the integrity slowly.