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I've decided to go for extension tubes, possible reverse-stacking, and a quality teleconverter to go with my not-so-excellent lenses.
I can't find the Tamron 1.5x teleconverter, but I've found plenty of 1.4x and 2x; I don't know which one will fit a Pentax K10 - one made for Minolta, Nikon, Canon…I googled Pentax 1.7x teleconverter and got something called ProMaster 2x teleconverter. No Pentax 1.7x on Adorama either.
As for getting extension tubes, I've read about the loss of light, but I just can't afford a new macro lens right now, and I don't know mind going all manual; it's the best way to learn IMO. I don't know what sizes to get. I'm not using AF lenses so I don't think I can get the Pentax auto extension tube set K.
I'd love to get into reverse-stacking, but again, I don't know what I need.
Oh, and hello!