The bremen68 entity posted thusly:

Looking for a source for a Lexan strip. I'd like to get a strip 1/4" X
1/4" X 8' (Shorter down to 4' would probably work too)

Try any place that does glass (windows, etc.) work. They usually have
lots of Lexan, though I don't know how the availability of that size.

More supplies for my little slot car project.

I know I can get squares and such at the BORG's but wasn't sure if
anyone knew of a place that makes this kind of item and what the cost
would be.

I'm open to suggestions for alternatives. It's going to be used as a
guide for routing curves on MDF board. It will be drilled every 1.5"
for nail holes to pin it down.

I'm pulling a blank on what else I could use. It needs to be stiff
enough to be able to guide the router, but flexible enough to do a
decent radius curve.

I'd use something thinner, and lay out the lines with a pencil, onto
1/4" hardboard, then cut/sand the hardboard, making a template. Then
use a guide bushing and a straight bit in your router to cut the slot
(assuming it's a slot you want to cut). Don't forget to allow for the
offset from the bushing to the bit.