Yep, just ordered some from Outwater and their min is 250 feet. I'm fairly certain that's where t-molding.com gets their product as well and then just doubles the pricing so I don't think it is going to be what you are looking for.
I do think I know what you mean by glossy. Take for example, San Francisco Rush. It's original t-molding had quite a glossy look to it. Upon further inspection it achieved this by just being a regular white t-molding that was then "sheathed" with a glossy yellow vinyl wrap.