To advertise and how??

  So I am debating the idea of advertising my shop in various places. The question is, how where, when and at what cost? There are several yahoo groups I am part of which offer the advantage of being free to post ads to, it is a specialized audience so there is more of a chance of results, one would expect. Then there is Ravelry, it costs to advertise here, but again, there is a specialized audience who are more likely to respond to ads. It will require a little more research to choose ad placement and duration. Etsy is a similar situation to Ravelry, specialized audience and again ad placement will make a difference. The downside to etsy is that I did a showcase there one time and had 0 response from it, I don't want to repeat a pointless experience. Finally Facebook offers a much wider base of exposure, but is not specialized at all. It's more of a get the kite aloft, cut the string and see if anyone responds to the attached note situation. I'm not sure it would work out at all, but it might be worth a try.
  Cost in advertising is an issue, this venture has been more of a way of expressing my creativity, not a money-making operation, so that means I need to take some savings and invest in the advertising that will make the most sense.
  Naturally, I prefer to go to shows and vend directly where people can handle and try the spindles, these are scarce on the ground due to the registration fees of some of the shows and my lack of networking and awareness of the shows. I know there are people who do the shows full time and have a full-time business, but I already have a full-time job that I cannot survive without, so "getting serious" business-wise about my spindle-making just isn't an option at this point.
  Anybody out there have some insights or advice?