guy I know wants to bet Yankees will sweep RedSox in upcoming series..

[EWS87]

he wants to risk 100 to me...i told him ill think about it and call him up with odds...is there any sites that I can book this bet on and then offer him slightly worse odds so that I cant lose?

and if not..what odds should I offer him??

i was thinking i risk 350 to his 100...but I'm a little skeptical because Boston doesnt really need to try this series...thanks for all help