There is a new acrostic crossword puzzle every two months which appears in the Alberta Views magazine. Solve it to reveal a quote by an Alberta author.
This site contains a 1000 free pages of puzzles, including wordsearches, acrostics, and crosswords. They offer quick fix puzzles to unregistered visitors, and many more to members (free).
This site has traditional quote-based acrostic puzzles, playable in online contests. Daily for subscribers, several for guests. There are also vocabulary and trivia acrostics.