I have to say, press on nails have come a long way since I was a teenager. Broadway Nails are awesome. Specifically, these are the type I purchased (for $5 at Target) for Ali's wedding:
I put them on Friday night, and just now the first one fell off (after I'd applied some pressure to it). You're supposed to have them on for less than 7 days anyway. They look just like acrylics from the salon, and are way cheaper. There's a little time involved in applying them - mostly just finding the right size for each nail and/or filing down a few to fit right, but the glue part took less than 5 minutes. I will be wearing these for all my fancy occasions from now on, until I could someday afford regular acrylics again!