Hey Cameron,
Long answer to a short question, lol:
For an idea of pricing check out www.gartersnakemorphs.com
That's Scott Felzers page. He's one of the few big breeders of garters out there and does produce some beautiful animals. As for the Oregon red spotted's, I have only seen them for sale in the classifieds once and they were wild caught, so I really couldn't tell you what they would normally go for. I paid a good chunk for my oregons, but they are cb adult mice eaters and therefore worth the extra money, in my opinion.
I got my infernalis from Casey Lazik, he was selling off a lot of his garters at the time, so I don't know if he still works with them, but I know Felzer sells the babies for $125.
Hope this helps :O)
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"Nothing happens in contradiction to nature, only to what we know of it."