Ooh this thread is great! One inexpensive beauty product that I've been using for years is mayonnaise on my hair!! Yes, your good ole' Hellman's from your local market. Although smelly, lol, it really does leave my hair super shiny...it's fairly inexpensive and it works!
I used to use inexpensive beauty products...but as you age, you notice those same make-ups don't work the same anymore, lol. I now use alot of Laura Mercier (expensive, I know) products and Stila! Although more expensive, I LOVE and LIVE by these! I noticed a difference the first time I started using them...I loved them so much, I had to stomach the price. gulp! The one good thing is that they last a long time...so that's how i justify it, lol.