Bar Mitzva between $36-$54. For weddings, between $54-$120 depending on what you can afford and your relationship. Many people give 72 -100 but plenty give 54 and there are some that exceed 100
Most normal people are acutely aware of the times we live in. Do not give more then you can afford just because others might.
Boruch Hashem at this time of year there are many Simchas in Klal Yisroel a few wedding and Bar Mitzva gifts can equal a month of Yeshiva tuition or a grocery budget don’t feel pressured to stretch yourself.
Good friends will appreciate your participation in the Simcha regardless of how much a gift you give.May you only have Simchas!