the best pizza stone for the weber is the red sky - but it appears the company either went under, or they suck at paying their hosting (and suck at maintaining their social media too).
The kettle pizza groupon seems like a good deal, assuming shipping is free. How much is shipping?
Factor in another 200 for the prograte, tombstone, and baking steel and its still a pretty good savings.
Local restaurant supply should have peels for ~$20