Hello William,
Thank you for your question about growing bristlecone pine in Bend. Yes, you can grow bristlecone pine in Central Oregon. You can contact local nurseries to inquire about purchasing a tree in Bend.

Bristlecone pine is discussed on page 20 of the OSU Extension publication, “Waterwise Gardening in Central Oregon”. You may find this publication helpful as you consider plants for your garden here in Bend. A list of recommended plants and trees is included:
Water-wise Gardening in Central Oregon | OSU Extension Service (oregonstate.edu)

The OSU Deschutes County Extension website provides many helpful publications about gardening in Central Oregon. Following is a link to this website, which will direct you to a variety of gardening topics specific for our geographic area and climate.
Central Oregon Garden Publications | OSU Extension Service (oregonstate.edu)

If you need additional information, I recommend you call the Deschutes County OSU Extension office in Redmond at<personal data hidden>. Ask to speak with Amy Jo Detweiler (oregonstate.edu), a member of the Horticulture Staff. Amy Jo welcomes your home garden questions and is a great resource.