I saw at Lowe's a chargriller combo gas and charcoal grill (half of the
grill is each, and they're independent) for 299.00. The side box is
available for the charcoal side as well. I was going to buy this since I
need a new one of both. Any comments/reviews/opinions on this?

the only thing is I dont see it on-line so I can't point it out to you;
I saw it at the store yesterday.