I know folks will probably disagree with me, however, if I had my druthers, rather than regging 'buygolf.us' , I'd go for 'buygolfclub.us' or 'buygolfclubs.us' ( both are still available ) , as that seems to be a more popular/exact search ( ovt shows, for example, 1371 searches for 'buy golf club' and 73 searches for 'buy golf' ) .
Even so, I do like buygolf.us out of the bunch, since I can see that as a merchant site. GolfGuides.us would be a nice one too, though maybe more focussed on videos rather than golf clubs - which can be a pretty high commission ticket item.