I bought my wool pressing mat from Amazon for around $50.00. I used the Amazon Prime and had it in 2 days.
I love it.
I use it on top of a cheap plastic table I bought from Job Lot. ($22.00) The table is similar to the 6 ft plastic party tables. I have no problem with it melting the table. I have a very good iron that has a high steam. It is similar to Rowenta. I just place my table and next to my sewing table and place my iron in a metal broiler pan for a toaster oven. It is great to iron seams of your blocks right after you sew.