You don't necessarily have to find an older motherboard. You can probably do just fine by purchasing an inexpensive motherboards made for one of the "other" CPUs out there that is trying to gain some ground against the industry leading Intel.
You will find some of those CPUs are great and run on cheaper chipsets and motherboards. Are they better? That's for consumers to decide for themselves, but it is worth mentioning there are some competitors out there well worth considering.