Viognier is a wine grape that produces a dry white, floral wine. For years it was a low-yield wine with very limited acreage planted but it became very popular starting in the 1980's when California and Canada started growing the grapes. In fact, according to Wine-Searcher there were fewer than 35 acres of the grape planted in the 1960's. Now the grapes are grown in almost all major wine producing countries. You'll often see Viognier blended with other grapes.
The wine varies in price and quality. Inexpensive wines can be purchased for as little as $12.99 up to bottles that exceed the $60.00 price tag.
I used to help bottle wine for a local vintner in Saratoga, California. As volunteers we got paid in wine (not a bag gig!). I ended up with a couple of cases of Viognier which I used a lot for cooking. Don't forget to use a splash of your leftover Vigonier to deglaze a pan.
If you're looking for a substitute for Viognier you can try one of these other white wines: