I bought some cheap MIDI and 3.5mm jack audio cables. I thought the audio cables in particular might be a bit flimsy since they were so cheap but they seem pretty well made. I haven't given them a proper workout yet though.

The MIDI cables aren't as flexible as I'd like but I wasn't expecting them to be at that price. They're good enough for now and they'll be useful as spares when I get some better quality ones. I have a Stagg cable (bought from Dawsons music shop) which is nice flexible silicone insulated cable but the plugs are too tight a fit and very hard to unplug so I don't like to use it in case I wear out my sockets. The plugs on the Kenables ones are ordinary sealed DIN plugs and are easy to plug and unplug.

My order was delivered quickly and the postage was very reasonable.