I've bought from Bluestone Perennials, got nice healthy little plants and they were tiny but cheap and healthy. Now they only sell in bigger, 4 in pots and the $$$ has gone up a lot. I haven't bought from them since. (When I was looking for a hardy geranium for fall planting, Bluestone's price was $12 for a 4" pot. Locally, they were being sold for $9 for big healthy gallon pots.)
I ordered from Santa Rosa Gardens, I believe three times this year. Reasonable prices for 4 in pots and they were nice healthy plants, and all are doing well. Once you become an established customer, they email coupons, good deals like 25% off. Shipping charges are not excessive.
I shop from local garden centers when possible, but I can't always find what I want here.
Karen