Any photography enthusiasts here? Need advice on used DSLRs

<p>Hey guys,
So I'm trying to convince my parents to get a DSLR for me. </p>

<p>My dad has an old (circa 1970) Asahi Pentax Spotmatic SP SLR camera. The batteries are getting harder and harder to find, but the lens are still really good. So I was thinking of using the lens with a digital SLR. </p>

<p>So, my question is this: Where can you get used DSLR bodies for less than a whole camera system (body + lens)? Preferably a Pentax DSLR, like the K-x, but I think, from what I've read about using these manual metering lens, that any camera would work (though I prefer Canon and Nikon if not Pentax).</p>

<p>If that's not possible, I guess I have to go buy macro lens/dslr adaptor for my iPhone. :'O</p>

<p>Thanks! I’ll try… haha my mom doesn’t really like ebay, she thinks it’s not trustworthy T_T
At school the cameras they have are mostly Canon T3s.</p>