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My suggestion would be;
1) go for a ride at lunchtime. There must be tonnes of people having work around you.
2) go to a wickes / similar and ask if they've got any spare broken bits.Ha, for some reason I thought it was a bit silly to suggest going hunting for a skip, but it is probably a reasonable option (and what I'd do if it hadn't been raining in the last couple days). Most builders merchants will have damaged sheets. I think I got a quarter sheet for a couple of quid from B and Q last time I needed a bit for a repair
Had exactly the same issue when I put in two pendent lights. Buying a whole board for a 3" hole seemed excessive. On the way to the hospital I saw a house refurb with a load of plaster in the skip, so nabbed some of that.
My suggestion would be;
1) go for a ride at lunchtime. There must be tonnes of people having work around you.
2) go to a wickes / similar and ask if they've got any spare broken bits.