030 accelerators for A500 are not so common and manage to sell at silly prices due to that.
Apart from that, making a new mobo (if it works) make's sure you got new hardware (with less possibilities of failing), embedded accelerator (plus RAM, or even IDE header etc), Zorro adapter inside etc. Try finding an Viper 530 first... in a decent price second
As you say it might be cheaper to find an 030 for A500 plus an A500 also... but DAMN that mobo is l33t and hurray for new Classic Amiga hardware @ 2010!!!
