I'm not going to say there isn't, but, I'm not aware of an easy or popular swap - a quick lock at what's available shows that the popular GM units top out at the same 105A output as the OE alternator, there are a couple of higher output GM units (CS144) which go up to as much as 145A, but I have no idea how difficult they are to mount or how much space they require.
Have the battery tested, I almost certain it's on the way out, if it is, replace it and see what happens.