That plant should be fairly hardy in your area. The big concern is soil drainage. Some soils in your area are heavy clays and don't drain well. Grevillea needs excellent drainage and a raised planting area can help as can additions of chunky composted bark material to the soil.
Regarding availability unfortunately we at the Q&A service don't have information on which plants are sold at the many retailers who carry Monrovia plants. Due to the seasonal nature of Monrovia's plants and limited quantities on many varieties, each garden center will offer a different array of plants. Not all plants are available in all regions at all times. Your best bet is to stay after your local retailer(s) and see if they can get the plants you are interested in.
Check out the following web site. It has a box for you to enter your zip code and will then give you a list of other local retailers that carry Monrovia plants:
Thanks for the question. Please stop in again soon!
Q&A Library Searching Tips