I recently bought an Elf lip oil called Rose Envy and I'm really enjoying it so far! I'll be the first to admit that the jumbo applicator and the gloss like texture of the product threw me off at first, but I've come around to it! It looks great too.
I don't know much about Elf and their contributions to sustainability in the makeup industry, but I don't imagine it's particularly outstanding. In the future, I'd like to buy more environmentally sustainable makeup. Open to suggestions!