This is a tough plant to grow indoors but, if you have a very bright south-facing window you have a shot at it. We have both seeds and plants in spring/summer but not now.
Here’s a couple of links that you might find helpful:
https://www.hgtv.com/outdoors/flowers-and-plants/herbs/growing-lavender-indoors
https://www.gardeningknowhow.com/edible/herbs/lavender/growing-lavender-in-pots.htm