I always advocate for trying out your local antique or furniture consignment store, FB marketplace or estate sale before buying a mirror at full price. But, sometimes you just don't want to or don't have time to wait and find one locally. Here are a few I love that are available online at affordable prices.
Anthropologie "dupe" $219 #amazonhome
$220 makes a statement with its height and ornate detail at the top.
On sale for $221! Beautiful, ornate mirror with a great shape to it!
$200 Nice wide mirror with the beveled edge of the classic "french" design
This mirror also comes in gold, but looks very pretty in this aged mint green.
($181) Or....if you have a little GIRL (or if crafty and want to save so you can paint or gold leaf)