www.richters.com has it, but they're sold out... maybe next year? Did you give it stratification? Since Lovage likes it cooler than where I live, I usually think it would need some stratification.... maybe a good frost?

I can't get it to grow at all, even starting with a small plant! Just too hot here. But the following might help you:

Lovage will tolerate either full sun or partial shade, depending on prevailing climate conditions. It grows best in climates where it can receive a period of dormancy in winter. In spring, or when the centres of the plants start to die out, established plants can be divided by digging up the dormant clumps and splitting them with a sharp spade. Sow seed in autumn as soon as they ripen, at an ideal temperature of 20C. Seeds are viable for 2-3 years. They need light to germinate, so just barely cover them, and they usually germinate in less than 2 weeks. Grown from seed, the plant may take 3-4 years to reach full maturity. Seeds do not store well, so use seed which is as fresh as possible. It prefers a very rich, moist but not heavy soil. If in sandy soil, fertilise well for good leaf colour. The plant dies back in winter but grows back in spring. Mulch the roots to protect against freezing. Lovage can be grown in a container. Make sure you keep it trimmed  it can withstand heavy pruning. It is a very adaptable plant and frequently occurs as a garden escape. It will last several years if well cared for. After about 4 years when it becomes too woody, the roots can be used as a vegetable after the bitter skin has been removed. Keep the plants well watered in autumn and spring. Water deeply to encourage deep root development and take special care that young plants are never allowed to dry out.

I've successfully grown Lovage in Wisconsin and Connecticut, but can't seem to keep it alive here in California. I'm sure it needs the cold, so might need to get it from an northern or eastern grower.

You don't say where you are from, but I see that you are in Zone 9. Lovage is considered a cool-weather herb here in the South, so give up trying to grow it in the summer. Instead plant it now and it should make it until the heat and humidity come in summer. I treat it as an annual because of the combined very high heat and very high humidity here in south Texas!