Bigger then 0.5m could be difficult to get, but you could go to some electronic store and order one, just take them Amiga manual so they can see the schematics and they will do it for a fair price
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Amigakit sell Amiga scart leads in 1.5M, 2.4M and 4.8M lengths. With prices from £4.89 to £17.61.
Alternatively you could make your own cable. Details of how to do this are on the classicamiga Wiki.
Or you could post a wanted advert on Amibay, or contact one of the Amibay traders to see if they make scart cables and get a quote from them. Amigamaniac (ultrareliable) might be able to do this.
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