lol....this should be in the general performance section, not high performance. Anyway, I'd suggest you save up for a new computer. Socket A which is so old and outdated, is not worth spending anymore money on. But heres the only motherboard, I can find off newegg:
Newegg.com - PC CHIPS M848A (V5.0) Socket A (Socket 462) SiS 746FX ATX AMD Motherboard - Retail
Still not worth it.