There is a nursery in Sumner called Windmill that has Abutilon for sale in pots this spring. So sorry I do not know the name of the nursery that sold the plants at the garden show. I did successfully overwinter my own Abutilon but it is very slow to leaf out. This tropical plant likes heat so grow it in the warmest part of your garden and keep it in a pot so you can move it to a protected corner outdoors in the winter. So sorry you lost yours but we all learn from the plants we kill. Keep the soil moist but not wet and you will have those  beautiful blooms of the 'Red Tiger' Abutilon soon.