I am a gas convert too! Even do bacon sarnies on it for breakfast at weekends - [the bread bit for hubby and kiddlywinks only]!!
For a cheap marinade - I buy ready mised dry spices they are carb free and cheap as they go along way. Just put your meat and a good few spoonfuls of spice in a plastic bag with plenty of oliveoil, tie in a knot squidge around a bit, leave to marinade and then throw on the grill. I've tried Swhartz, Fajita, Piri-Piri, BBQ really yummy and they do a PilauRice spice that you should use with Rice but as I'm not cooking very much rice used it on chicken the other week and chargrilled and it was delicious. The marinading with lashings of oliveoil keeps the meat really moist too.
Loving the sunshine!!