Is there a dual processor mobo for AMD sempron?

Im trying to find a dual processor motherboard that will take 2x AMD Sempron 3000+ (s754).

And im assuming i coudlnt mix processor speeds....

Otherwise i have a spare (AMD thunderbird 1.333) and (AMD Athalon XP 2400+)

or if i can still buy either of those processors and pop them in a dual motherboard....

i dont know of dual s754 motherboards.