Lots of good online sources - Joy Creek, Brushwood and Silver Star Vinery are a few of the best.

i CANT RECOMEND BRUSHWOOD ENOUGH. THE PLANTS ARE REALLY BIG AND HAVE MULTI STEMS. DAN HAS DEALS EVERY SO OFTEN SO GET ON HIS MAILING LIST. THERES ONE RIGHT NOW FOR 10% OFF I THINK BOBBY

Brushwood, Silver Star and Joy Creek are also my favorite clematis suppliers.

Here is a copy of the email from Brushwood just mentioned by bobbygil:

April Showers Special!

All over the internet I keep seeing cute messages and gripes about the winter hanging on too long. Cleverly modified computer messages about "failure to load spring" are among my favorites. I also see friends' Facebook posts showing images of their weather; either pictures out their windows or their weather maps showing storms and continuing low temperatures. This morning it is quite cold here but still springlike for us and I'm excited to do some planting with the whole family this weekend! For those of you still dreaming of spring (and everyone already enjoying it!), here's a coupon code just for this weekend. Type SHOWERS in the discount box at checkout for 10% off your order. Yes, that still includes shipping in the discount! (shipping costs have skyrocketed this year and we know you're feeling it). The coupon is even good for plants already on sale like our roses which are on special for another week only and some of our cool new clematis! New orders only, please.

Thank you so much for sharing the email. I just ordered two more clems (not that I needed them, but...).