I have used the old fashioned freeze/phenol method to purify PCR products from a gel and for my purposes, it worked well. The protocol is listed here: http://www.genome.ou.edu/protocol_book/protocol_partI.html (under E. Elution of DNA fragments from agarose). My modification to the protocol was that I did each of the freeze/melt step twice instead of only once.

If you are not using agarose mini-gel to run your PCR product, I suggest that you do that since running it on a larger gel will distribute your sample over a larger area.