Check craigslist and search for

• “old golf clubs” – at the time of this post there were 41 options of which I think 10 were sets that would qualify; in fact, there is a set of MacGregor irons and Wilson woods  in Lakewood for only $15.
• “vintage golf clubs” – at the time of this post there were a dozen or so listings of clubs in the Denver/Colorado region
• “golf clubs” – a generic search can get some other options that might slip through the cracks.  Remember, many people that own old clubs don’t necessarily know how to describe them

Another option is to check out local garage sales (also easy to find on craigslist).  Lastly, don’t forget to stop by some pawn shops and thrift stores.  Arc, Savers, Goodwill and others all have some great options … many times including bags.