New Roof Fabric. How much?

[flintstone]

I've been fiddling with my roof fabric trying to get the colour of the top section to match the rear. The latter is probably the original whereas the rear section is, I believe, about a year old.

I've experimented with coats of Renovo and Fabsil to no avail so it looks like I'll have to get the top fabric replaced and soon before the rear fades too much and I'm back to square one.

Any recommendations? What's the going rate?