I love resin appliques and I use them all the time. I probably got a little "applique happy" in my own home. I love the elegance and charm, along with the vintage feel an applique can give to any type of decor.
Finding a good supplier is important. You won't find resin appliques easily, and when you do they may be pricey. I have also found that most suppliers don't have a good selection.
Appliques vary in price according to material, size and where you buy them. Pretty much all of the applilques I have used over the years have been from an online store called Do It Yourself Chic. I have always been very happy with the appliques I have bought there and they are packaged well and sent with instructions. They have tons to choose from, and the designs are gorgeous!
A few weeks ago I did some research and decided to try making some myself in order to save money. I made some molds from polymer clay today. They seemed to turn out well. Tomorrow I am going to put the resin in and try making my first appliques. I'll let you know how it turns out!