There are a few alternatives:
1. Get a clone PCB by Ted Jorgensen and re-populate it (you'll need the old board to transfer some rare components like connectors).
2. Get someone to build you a new populated board or send a clone board for population (Andrew Jury can do this)
3. Buy an alternate new board: the KIWISix (more expensive, but many more features than what a default Polysix has).