For hardy roses, I only order from this site. www.heirloomroses.com

I have ordered tons of plants from www.springhillnursery.com . The biggest thing with this company is to plant your plants right away. They only ship during the ideal growing seasons for the specific plants and your specific area so as soon as you get them, get them in the ground, or run the risk of the plants mildewing or stunted growth.

www.michiganbulb.com is another great site to order perennial bulbs from and I've had great luck with their lilies.

For orchid supplies, www.repotme.com is a great site to get orchid potting mix or pots or pretty much anything orchid related.

As you can tell, I'm a HUGE online shopper but the ones above are sites that I personally have ordered from with great results. Good luck and enjoy!

Yay! Thanks for all the sites! Know of any for vegetable gardening?

Springhill Nursery does sell some fruit and veggie plants. I'm not sure which ones. I don't trust myself with the food variety so I just stick with the pretty-looking ones!

I ordered a collection from Michigan Bulb Co. and I'm impressed so far.  With all of their negative reviews I was hesitant but for the water smart garden it was around $30 so I figured I'd try.  I planted everything mid April and they are doing really good so far! 

I ordered all my heirloom veggie seeds from this site this year and I have gotten a higher germination rate from their seed than what you normally get with heirlooms: http://www.underwoodgardens.com/ 

Lowe's and Home Depot also have heirloom tomato plants this year :)