Fantastic food-grade grease in a handy tube. I use it for o-rings and tap washers
I was on the lookout for it a while back, and could only find it for $15 each delivered, or 3x 30g for $30
250g tub ~$22, only one in stock
INOX MX6 is safe on rubber, and is ideally suitable for all plumbing O-rings and seals, food machinery O-rings and seals, pneumatic control valve O-rings and seals, Diving gear O-rings and seals, anywhere rubber or synthetic O-rings and seals are used.
Check the drip pan on your bbq. Plenty of free food grade grease there