Their 152's must be worth only about $25-30000 each. They'd have to sell all of them to afford 1 new 172 (though could get a few second hand at the moment with the exchange rate!). By waiting so long to renew the fleet they are essentially left with nothing except their buildings and Murrayfield to bargain with.
Or is suppose they could pass the hat around to the members and hope someone chips in a million or two!