Catalytic Converter=Cash

We recently had one of these things taken out of our vehicle. I took it to our local recycling center and asked if they buy them used. They did, I expected maybe $5 for it. They offered me $20. Sweet, I'll take it! I think I was a little too excited, and he regretted offering me that much. I would have taken the $5. So I called my husband really excited. He asked me "what foolish thing are we going to spend it on? I think you need MORE picture frames or something!" Well, I did want to make a new bed-skirt for our bed, but now that he made that comment, I have to prove that I can spend the money wisely. Any suggestions? I'm really bad about spending money wisely!

Honestly, I don't think I should have to spend it wisely. I already did a wise thing by having it recycled. Right?