We had some panes replaced in our conservatory but it was a long time ago. I'm afraid I can't remember how much it was then but I remember it cost a lot less than I expected, but when you think of the initial cost of the window, £100 doesn't sound a lot to me.
Can you get a couple more quotes and compare them to see if there's much difference?
Assuming you are talking uPVC frame, what, exactly, do you mean by 'leaking' and 'caused by shrinkage of the rubber gasket'? Is it leaking into the home, on to the window board or elsewhere? If you mean the rubber gasket (usually black) between the frame and glass is defective and allowing rain to get into the frame, it should drain away to the outside with nothing coming to the inside --- there are ( should be ) holes cut in the frame beneath the glass, leading to the outside, to do that. The water flows out on to the top of the sill and runs off, sometimes leaving dirty streaks. If that is the gasket you mean then, assuming the frame has 'internal glazing beads' --- the uPVC strips which hold the DG unit in --- then it can be fixed from the inside, no need for ladders etc.. If it is 'external glazing beads' and is not an openingwindow then it's more difficult ( expensive on time ). If it's internal beads then you could replaced the gasket youself if you are careful and can get the same ( or suitable replacement ) gasket from a local window maker. That shouldn't cost more than a few ££ to do both the inside and outside gaskets.. Getting the DG unit out is not really difficult once you know how and take care. I' ve done it a few time with no problem, and there's a window maker in the building behind my home. 
If you can DIY and are really tight for cash, then you could use some clear silicone sealant to apply all around the gasket ( after cleaning it ) . That should cost about £2 -£3 for a tube of sealant, about 300 ml, and about the same again for the applicator gun if you don't have one. Another way is to swap over the inside and outside gaskets, the inside ones should be in better condition than the outside ones.
If by 'leaking' you mean the DG unit is misted up then that's another matter and is caused by the breakdown of the sealant around the DG unit itself, not seen with the DG fully fitted. The normal fix for that is to fit a new DG unit --- and about £100 sounds quite reasonable for that and should include new gaskets to at least the outside. As before it can be a DIY job and there is a way to fix it without a new DG unit. That involves a little more work that removing the DG to dry it out and re-apply sealant to its edges. Ask if you want more info..
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