Am I being overcharged for roman blinds?

[Ezrah]

How much does it cost to have roman blinds made? For example, one of the windows is 120x155cm, and I’ve been quoted £250. This doesn’t include the material, lining or fitting. Is this the norm?

I used romanblindsdirect recently and paid £100 for a custom made blind (lined) with all the fittings - can't remember dimensions but it's a really big window.
I promise I'm nothing to do with them, but was really pleased. I ordered about a million fabric samples from them too.
You have to fit it yourself but I'd think a handyman would be pretty quick/cheap to do this.