Hi Barry, seeing that Briggs and Stratton and Honda's are now being manufactured in China as complete engines, and spare parts as well....it is hard to advise you which way to go. A popular choice is the Honda GX120 and from what I can find, it has a 3/4" shaft.
As for prices Barry, you would be wise to shop around reputable dealers. wink
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin