I have a fairly new TV, but it does not have any RCA or S-Video inputs. Can I run the Toshiba SD-3109 DVD Player through the video inputs on my VCR, then coax to my tv? Or will I have the Macrovision problem I have been reading about? Any Ideas?

Chances are very high you'll experience the Macrovision problem doing that. You'd probably need to get a Macrovision remover (such as the Sima Color Corrector). I'm extermely surprised your TV has no RCA jacks on it - they have been a standard for a long long time. My Sony stereo 14" TV built in 1986 has a RCA video input plus RCA audio out!

What about bypassing the VCR and running an RF modulator, for $30 it seems like a viable option. Bear in mind, I realize the picture quality will suffer a bit, but I want to be able to use my DVD until I can afford a TV upgrade.

Yes, you can do that too -- but if your VCR is using that coax input...

I just got Radio Shack's new RF modulator and I have to say, what a great piece of equipment. Not only could I run my DVD to it the out to the TV, but it has an ANT IN coax so I can run my VCR into that then out to the TV. When the DVD is off, no signal comes through, so I can watch regular TV or VCR. Then if I want to watch a DVD, I just power it up and it bypasses the VCR automatically and plays, and here's the best part, WITH NO DISTORTION OR PICTURE NOISE. $30 vs. $300 + for a new TV. I love it!

Just to let you know, those RF modulators have been around for years. They came with the original nintendo and before that, IIRC. I am sure the quality and signal loss has improved though.