Your situation reminds me of mine a few years ago. I have been friends with someone since we were children and we still see each other and keep in touch. Her son was getting married a few years ago and I was invited to the shower. Like you, I am on a limited income. The way I handled it was, I put in an amount that I was comfortable with. In other words, an amount that I wasn't going to be feeling guilty because I didn't give enough. And, remember, it's the thought that counts. If they are truly friends, they will appreciate any amount you give.