The wool pressing mats are fabulous!! But they can be a bit pricey. I’m all for finding good bargains but I would buy a wool mat that seems too inexpensive alongside others. Who knows what they are really made of and where they are made, I’ve purchased the mats I have from good vendors at big quilt shows and the one for my ironing board came from Quilt In A Day when they had a nice sale. I thunk it would be better if you started to save up and get a nice size from a reputable seller, I do have a small,one for those small blocks but the one I use at home and take to quilting guilds (remember those!!) is a 17” x 17”. It works for most sizes if blocks I sew.
Sandy in Mooresville, NC