Syncros gone on it, I have no syncro on 2nd and 4th in the 90 and simply live with it because its too cold out and I can't be bothered doing it until the summer.
The key to living with it (its worth learning a new skill here as its cheaper than a new box) is to learn how to match your engine and road speed for the different gears. I am a great believer in doing this all the time in any vehicle as it puts less wear on the baulkrings etc...
General rule of thumb is for every 1000rpm in first you do 5mph, then 2nd 10... 15, 20, 25 as you climb the gears.
So using that as a rough calculation method you can work out that if the vehicle is doing 40mph in 5th (1600rpm ish) and you want to drop into 4th, so clutch while you increase the engine revs so the engine is doing about 2000 rpm, then pull it into 4th it should go without fail. You don't need to get it to sit at 2000 dead on (you will begin to learn the engine note at which is just right though) if you go slightly faster then slightly pull back into fouth as the engine drops it will catch and fall into 4th as it hits the right point. Going up gears you need to let the revs fall obviously, I find that if you accelerate to 30 in 3rd, then pull out of 3rd and pause for about a second then pull it into 4th it goes no bother.
I have used this technique when my clutch failed completely and it got me home no bother using all the gears (doesn't work from a standing start you need to select 1st and then start engine).
You might crunch away for a bit but you should be able to get the hang of it fairly quickly, you need to change up through the gears quicker too.
Might let you get by until landy funds and more available.
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