I have Bakers Pride 151 with two 18 x 24 inch stones that are flaking on top. I need to replace them and don't want to pay official BP prices ($600+). Anybody know a good source. Waiting for a quote from Fibrament-D. Also, I have 1.5 inch thick stones, has anybody had luck stacking a thinner (.75 or 1 inch) stone on top of the old stone? Thanks.