Actually you can get MARI indie 3.0 + MODO indie 901 Bundle from steam for £289.99 as a permanent licenses, while from what I can see, Maya LT is £222.00 for a year subscription.
MARI indie 3.0 + MODO indie 901 Bundle: http://store.steampowered.com/sub/91036/
Maya LT: Maya LT Software | Get Prices & Buy Official Maya LT 2020