Hi, John and Mod AVB
You'll find most of the Caps you'd require are in the 450 volt mark, this isn't an issue at all as it has plenty of headroom and will be much cheaper and reliable than a 230 volt unit. Most appliance manufacturers that are using electric motors are using 450 vac caps.
Also you don't have to be super accurate on the uf figure either.
The following unit will be a good reliable component as made for Whirlpool in the USA,
http://www.ebay.com.au/itm/WA482156-Whirlpool-U-S-A-Motor-Start-Capacitor-189-227-u-f-GENUINE-WP011/201234025725?hash=item2eda7b8cfd:g:3GwAAOSwQJhUgPUo
You'll find that the one you require won't be any cheaper than around the $30 mark as that's about the price point for the type of cap you need.
Sorry but the link is not clickable, so just highlight and right click to get "Open Link" option.
Cheers,
BB.