I’m not really a bowtie guy myself (basically, I end up really angry for half an hour trying to get it tied right), but I do have a few recommendations:
Cheap: The Tie Bar – Tons of options, all for $15. I would stay away from their satin silk ones, which tends to fray easily if you have rough/dry fingers. But the twill silk, wool and cotton ones should be just fine. And, each of their styles comes in self-tie.
Mid-range: The Cordial Churchman – If you’re the type of person who wants something hand-crafted in the U.S.A. and likes the idea of helping a husband and wife team grow their independent business, then this is a great choice. They’re home of the official Put This On bowtie and prices average around $30. Best of all, since each of them are handmade, you get to pick what kind of style you want (darted, classic, butterfly, etc.), which is a great touch.
If you’re into the more trad-ish, preppy look, then give J.Press a try. Their entire collection is on sale right now. Mountain & Sackett also has bowties in a similar price range.
Pricey: If you’re into the more dandy-ish appeal of a bowtie, then I’d suggest checking out Fine & Dandy Shop and Shrine Haberdashers. The patterns at these places are a bit more unique and bolder, in my opinion.
If you’re into more casual fabrics and vintage appeal, General Knot Co. is worth taking a look at, where they use deadstock fabrics from decades ago to create more casual neckwear. Definitely rare patterns that are unlikely to be seen worn by many others.